Category: Machine Shop

Mechanical widgetry

CNC 3018-Pro: DRV8825 Drivers at the Edge of Madness

Having previously concluded running the CNC 3018-Pro steppers from 12 V would let the DRV8825 chips provide better current control in Fast Decay mode at reasonable speeds, I wondered what effect a 24 V supply would have at absurdly high speeds with the driver in 1:8 microstep mode to reduce the IRQ rate.

So, in what follows, the DRV8825 chip runs in 1:8 microstep mode with Fast Decay current control. You must apply some hardware hackage to the CAMTool V 3.3 board on the CNC 3018-Pro to use those modes.

In all the scope pix, horizontal sync comes from the DRV8825 Home pulse in the top trace, with the current in the two windings of the X axis motor in the lower traces at 1 A/div. Because only the X axis is moving, the actual axis speed matches the programmed feed rate.

Homework: figure out the equivalent two-axis-moving speed.

The 12 V motor supply works well at 140 mm/min, with Fast Decay mode producing clean microstep current levels and transitions:

3018 X – Fast – 12V – 140mm-min 1A-div

The sine waves deteriorate into triangles around 1400 mm/min, suggesting this is about as fast as you’d want to go with a 12 V supply:

3018 X – Fast – 12V – 1400mm-min 1A-div

Although the axis can reach 3000 mm/min, it’s obviously running well beyond its limits:

3018 X – Fast – 12V – 3000mm-min 1A-div

The back EMF fights the 12 V supply to a standstill during most of the waveform, leaving only brief 500 mA peaks, so there’s no torque worth mentioning and terrible position control.

Increasing the supply to 24 V, still with 1:8 microstepping and Fast Decay …

At a nose-pickin’ slow 14 mm/min, Fast Decay mode looks rough, albeit with no missteps:

3018 X – Fast – 24V – 14mm-min 1A-div

At 140 mm/min, things look about the same:

3018 X – Fast – 24V – 140mm-min 1A-div

For completeness, a detailed look at the PWM current control waveforms at 140 mm/min:

3018 X – Fast detail – 24V – 140mm-min 1A-div

The dead-flat microstep in the middle trace happens when the current should be zero, which is comforting.

At 1400 mm/min, where the 12 V waveforms look triangular, the 24 V supply has enough mojo to control the current, with increasing roughness and slight undershoots after the zero crossings:

3018 X – Fast – 24V – 1400mm-min 1A-div

At 2000 mm/min, the DRV8825 is obviously starting to have trouble regulating the current against the increasing back EMF:

3018 X – Fast – 24V – 2000mm-min 1A-div

At 2500 mm/min, the back EMF is taking control away from the DRV8825:

3018 X – Fast – 24V – 2500mm-min 1A-div

The waveforms take on a distinct triangularity at 2700 mm/min:

3018 X – Fast – 24V – 2700mm-min 1A-div

They’re fully triangular at 3000 mm/min:

3018 X – Fast – 24V – 3000mm-min 1A-div

In round numbers, you’d expect twice the voltage to give you twice the speed for a given amount of triangularity, because the current rate-of-change varies directly with the net voltage. I love it when stuff works out!

At that pace, the X axis carrier traverses the 300 mm gantry in 6 s, which is downright peppy compared to the default settings.

Bottom lines: the CNC 3018-Pro arrives with a 24 V supply that’s too high for the DRV8825 drivers in Mixed Decay mode and the CAMTool V3.3 board’s hardwired 1:32 microstep mode limits the maximum axis speed. Correcting those gives you 3000 mm/min rapids with good-looking current waveforms.

I’m reasonably sure engraving plastic and metal disks at 3000 mm/min is a Bad Idea™, but having some headroom seems desirable.

2019-09-19
Mailbox Door Rebuild

The flanges around the door of our giant mailbox rusted through, leaving the door to bend along the embossed (debossed? Whatever) lines across the front. Eventually, the bend got bad enough to keep the door from latching closed, but reviews of the current crop of mailboxes suggest they’re even more prone to rusting after even fewer years.

Well, I can fix that:

Mailbox door rebuild – installed

Because the bottom third of the door, basically everything around and below that horizontal ridge, had corroded, the general idea was to stiffen it with an internal plate:

Mailbox door rebuild – interior

The array of small holes suggest the plate’s rich lived experience. Some are even tapped!

External angle brackets stiffen the sides along the corroded flanges and surround the equally corroded pivot holes:

Mailbox door rebuild – exterior

The term “brick shithouse” springs unbidden to mind, doesn’t it? Those spare holes come from previous uses; I decided this application didn’t demand cosmetic perfection and, as a result, the remaining angle stock has no holes at all.

Also, the angle brackets are as long as they are because that’s the maximum throat depth for Tiny Bandsaw™. I splurged on a Proxxon 10-14 TPI blade (for future reference: PN 28172) that cuts aluminum like butter, much better than the stock 14 TPI blade.

The hinge pins used to be rivets. After careful consideration, I replaced them with 1/4-20 button-head cap screws:

Mailbox door rebuild – hinge detail

Yes, the sheet metal now pivots on screw threads, rather than a nice smooth cylinder. The nyloc nut maintains the proper amount of looseness around the battered sheet metal.

While I had the door open, I slobbered hot melt glue over the flag anchor, which should keep it from spitting the ratchet pin into the roadside debris ever again:

Mailbox door rebuild – flag anchor

A pleasant evening of Quality Shop Time, indeed!

The alert reader will note I’m securing aluminum plates with stainless steel hardware on a (nominally) galvanized steel box, thereby forming several batteries with a brine electrolyte from wintertime road salt. My engineering judgement determined this repair will last Long Enough™ and, most likely, succumb to somebody not quite making the curve while accelerating from the traffic signal.

Aaaaand those painted numbers still look pretty good after four years.

2019-09-18
Schwalbe Marathon Plus and Michelin Protek vs. Glass Chip

The rear tire of my bike was flat before our morning ride and pumping it up produced a hissing sound with a spray of tube sealant:

Marathon tire puncture – tread gash

We run Schwalbe Marathon Plus tires on the rear of our Tour Easy ‘bents, because otherwise I’d be spending far too many hours repairing flats by the side of the road. Searching the blog for the obvious keywords will produce many examples of what it’s like to ride a bike in Dutchess County NY.

Schwalbe says the tires have 5 mm of “highly elastic special rubber” and claims “Even thumbtacks can’t puncture it.” They use the term “Flat-Less” in the sense of “flat less often”, rather than “not flatting”, which seems disingenuous at best.

Flatting less often may be true, but they obviously haven’t tested against Dutchess County road debris:

Marathon tire puncture – glass chip

It’s not quite 5 mm in the longest dimension, but it was embedded deep enough in the tire tread to cut through the armor belt and nick the Michelin Protek tube:

Marathon tire puncture – tube damage

Of course, the hole is dead-center between the two bumps that are supposed to compress around the puncture while the goo fills and seals the void.

Before taking everything apart, I tried gently inflating the tire and putting the puncture at the bottom to let the sealant fill the hole overnight. In the morning, the tire was once again flat, although the floor wasn’t covered in goo. Pumping the tire up produced another spray of sealant.

It’s likely the Protek tube got me home with a slow leak on the previous day’s ride, but it definitely didn’t solve the problem and, frankly, I’ve had ordinary tubes do the same thing. Given the trivial size of the puncture and the complete lack of permanent self-repair, I don’t know what kind of damage it’s supposed to cure.

I’ve already discarded two Protek tubes with slow leaks through the valve stem and no punctures, so they’re definitely not worth the hassle. Michelin no longer lists the tubes on their bike tire site, so it seems they agree.

I made up a boot by punching a 5 mm polypropylene disk, sticking it to a small tire patch, then sticking the patch over the puncture on the tire. With a bit of luck, nothing will line up with the gash and punch through the boot.

I recently replaced all four tires on the Forester, slightly ahead of schedule for reasons not relevant here, and it’s worth noting that a Marathon Plus tire costs about a third of what I paid for a car tire; they’re not to be discarded lightly.

2019-09-14
CNC 3018-Pro: Milling the CD Fixture

It turns out that the outer diameter of CD platters isn’t quite as perfectly controlled as you (well, I) might imagine, although the differences between CDs from different sources amounts to perhaps ±0.1 mm. Of course, instantly after putting the tape-down fixture into use, the next few discs atop my stack of scrap CDs were just large enough to not quite fit.

The Sherline’s workspace can’t maneuver the holder’s perimeter around the spindle, so embiggening the OD calls for the rotary table. The general idea is to clamp the center of the fixture to the rotary table, run a small end mill about 0.1 mm into the fixture’s OD, spin the table one revolution, and be done with it.

Of course, the rotary table’s 3/8-16 threaded center hole doesn’t match the fixture’s 6 mm center hole: we need an adapter. Start with a 1 inch long 3/8-16 stainless steel hex bolt, center drill the end, peel off the hex head, then turn to 6 mm OD, going down far enough so the threads don’t stick up out of the table too much:

CNC 3018-Pro – CD fixture milling – bolt turning

The Sherline uses 10-32 screws, so poke a #16 drill 15 mm into the bolt to get maybe 25% thread depth (because it’s a blind hole into stainless steel for an application requiring minimal strength and I hate breaking taps), tap 10-32, clean out the hole, and call it All Good:

CNC 3018-Pro – CD fixture milling – rotary table adapter

Find the trim plate from an old faucet to reach around the central boss, stack up enough flat washers to meet the nut, snug a Sherline spherical nut + washer set (because it’s within reach), chuck up a 1/8 inch mill, and have at it:

CNC 3018-Pro – CD fixture milling

The fixture sits atop an aluminum plate cut to fit a smaller version of the table riser, but this requires zero fancy alignment. The 6 mm adapter centers the fixture on the rotary table and the cutter sits at a fixed radius from the center wherever it contacts the fixture rim; just spin the table and it cuts a neatly centered circle.

A test fit showed the oversize discs fit perfectly:

CNC 3018-Pro – CD fixture milling – test fit

Bonus: a nice new adapter for the rotary table!

2019-09-13

CNC 3018-Pro: Tape-Down Platter Fixture

Diamond drag engraving doesn’t put much sideways force on the platters, so taping the CD in place suffices to hold it:

CNC 3018-Pro - CD taped to platform — CNC 3018-Pro – CD taped to platform

Wrapping a flange around the screw-down platter fixture provides plenty of surface area for tape:

Platter Fixtures - CD on 3018 - tape flange — Platter Fixtures – CD on 3018 – tape flange

Which looks exactly as you think it would in real life:

CNC 3018-Pro - CD fixture - taped — CNC 3018-Pro – CD fixture – taped

Admittedly, masking tape doesn’t look professional, but it’s low-profile, cheap and works perfectly. Blue painter’s tape for the “permanent” hold-down strips on the platform would be a colorful upgrade.

It’s centered on the platform at the XY=0 origin in the middle of the XY travel limits, with edges aligned parallel to the axes. Homing the 3018 and moving to XY=0 puts the tool point directly over the center of the CD without any fussy alignment.

The blue-and-red rings around the center hole assist probe camera alignment, whenever that’s necessary.

The OpenSCAD source code as a GitHub Gist:

	// Machining fixtures for CD and hard drive platters
	// Ed Nisley KE4ZNU February … September 2016
	// 2019-08 split from tube base models

	PlatterName = "CD"; // [3.5inch,CD]

	CNCName = "3018"; // [3018,Sherline]

	TapeFlange = true; // Generate tape attachment

	PlateThick = 5.0; // [3.0,5.0,10.0,15.0]

	RecessDepth = 4.0; // [0.0,2.0,4.0]

	//- Extrusion parameters must match reality!

	/* [Hidden] */

	ThreadThick = 0.25;
	ThreadWidth = 0.40;

	HoleWindage = 0.2;

	Protrusion = 0.1; // make holes end cleanly

	inch = 25.4;

	function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);

	module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
	Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
	FixDia = Dia / cos(180/Sides);
	cylinder(d=(FixDia + HoleWindage),h=Height,$fn=Sides);
	}


	ID = 0;
	OD = 1;
	LENGTH = 2;

	//———————-
	// Dimensions

	P_NAME = 0; // platter name
	P_ID = 1; // … inner diameter
	P_OD = 2; // … outer diameter
	P_THICK = 3; // … thickness

	PlatterData = [
	["3.5inch", 25.0, 95.0, 1.75],
	["CD", 15.0, 120.0, 1.20],
	];

	PlatterSides = 345; // polygon approximation

	B_NAME = 0; // machine name
	B_OC = 1; // … platform screw OC, use small integer for slot
	B_STUD = 2; // … screw OD clearance

	BaseData = [
	["3018", [5.0, 45.0], 6.0], // slots along X axis
	["Sherline", [1.16inch,1.16inch], 5.0], // tooling plate

	];

	PlateRound = 10.0; // corner radius

	FlangeSize = [5.0,5.0,3*ThreadThick]; // all-around tape flange

	//– calculate values based on input parameters

	PI = search([PlatterName],PlatterData,1,0)[P_NAME]; // get platter index
	echo(str("Platter: ",PlatterName));
	Platter = [PlatterData[PI][P_ID],
	PlatterData[PI][P_OD],
	PlatterData[PI][P_THICK]];

	BI = search([CNCName],BaseData,1,0)[B_NAME]; // get base index
	echo(str("Machine: ",CNCName));

	AlignOC = IntegerMultiple(Platter[OD],10);
	echo(str("Alignment pip offset: ±",AlignOC/2));
	AlignSlot = [3ThreadWidth,10.0,3ThreadThick];

	StudClear = BaseData[BI][B_STUD]; // … clearance

	StudOC = [IntegerMultiple(AlignOC + 2*StudClear,BaseData[BI][B_OC].x), // … screw spacing
	BaseData[BI][B_OC].y];
	echo(str("Stud spacing: ",StudOC));
	NumStuds = [2,1 + 2*floor(Platter[OD] / StudOC.y)]; // holes only along ±X edges
	echo(str("Stud holes: ",NumStuds));

	BasePlate = [(20 + StudOC.x*ceil(Platter[OD] / StudOC.x)),
	(10 + AlignOC),
	PlateThick];
	echo(str("Plate: ",BasePlate));

	Flange = [BasePlate.x + 2FlangeSize.x,BasePlate.y + 2FlangeSize.y,FlangeSize.z];
	echo(str("Flange: ",Flange));


	//———————-
	// Drilling fixture for disk platters

	module PlatterFixture() {

	difference() {
	union() {
	hull() // basic plate shape
	for (i=[-1,1], j=[-1,1])
	translate([i(BasePlate.x/2 – PlateRound),j(BasePlate.y/2 – PlateRound),0])
	cylinder(r=PlateRound,h=BasePlate.z,$fn=4*4);
	if (TapeFlange)
	hull()
	for (i=[-1,1], j=[-1,1])
	translate([i*(Flange.x/2 – PlateRound),
	j*(Flange.y/2 – PlateRound),
	0])
	cylinder(r=PlateRound,h=FlangeSize.z,$fn=4*4);
	}

	for (i=[-1,0,1], j=[-1,0,1]) // origin pips
	translate([iAlignOC/2,jAlignOC/2,BasePlate.z – 2*ThreadThick])
	cylinder(d=4*ThreadWidth,h=1,$fn=6);

	for (i=[-1,1], j=[-1,1]) { // alignment slots
	translate([i*(AlignOC + AlignSlot.x)/2,
	j*Platter[OD]/4,
	(BasePlate.z – AlignSlot.z/2 + Protrusion/2)])
	cube(AlignSlot + [0,0,Protrusion],center=true);
	translate([i*Platter[OD]/4,
	j*(AlignOC + AlignSlot.x)/2,
	(BasePlate.z – AlignSlot.z/2 + Protrusion/2)])
	rotate(90)
	cube(AlignSlot + [0,0,Protrusion],center=true);
	}

	for (i=[-1,1], j=[-floor(NumStuds.y/2):floor(NumStuds.y/2)]) // mounting stud holes
	translate([iStudOC.x/2,jStudOC.y/2,-Protrusion])
	rotate(180/6)
	PolyCyl(StudClear,BasePlate.z + 2*Protrusion,6);

	translate([0,0,-Protrusion]) // center clamp hole
	rotate(180/6)
	PolyCyl(StudClear,BasePlate.z + 2*Protrusion,6);

	translate([0,0,BasePlate.z – Platter[LENGTH]]) // disk locating recess
	rotate(180/PlatterSides)
	linear_extrude(height=(Platter[LENGTH] + Protrusion),convexity=2)
	difference() {
	circle(d=(Platter[OD] + 2*HoleWindage),$fn=PlatterSides);
	circle(d=Platter[ID] – HoleWindage,$fn=PlatterSides);
	}

	translate([0,0,BasePlate.z – RecessDepth]) // drilling recess
	rotate(180/PlatterSides)
	linear_extrude(height=(RecessDepth + Protrusion),convexity=2)
	difference() {
	circle(d=(Platter[OD] – 10),$fn=PlatterSides);
	circle(d=(Platter[ID] + 10),$fn=PlatterSides);
	}
	}

	}


	//———————-
	// Build it

	PlatterFixture();

view raw Platter Fixtures.scad hosted with ❤ by GitHub

2019-09-12

DRV8825 Stepper Driver: Adding a Home Output

The DRV8825 stepper driver chip has a -Home output going active during the (micro)step corresponding to 45°, where both winding currents equal 71% of the peak value:

DRV8825 pinout

Unfortunately, pin 27 is another unconnected pin on the DRV8825 PCB, without even a hint of a pad for E-Z soldering.

It’s also an open-drain output in need of a pullup, so I globbed on a 1/8 W 10 kΩ resistor in addition to the tiny wire from the IC pad to the left header pin:

DRV8825 PCB – Home signal output

Read it from the right: brown black black red gold. Even in person, the colors don’t look like that, not even a little bit: always measure before installation!

The right header pin is firmly soldered to the PCB ground pin I also used for the 1:8 microstep hack. The whole affair received a generous layer of hot melt glue in the hope of some mechanical stabilization, although hanging a scope probe off those pins can’t possibly end well.

The general idea is to provide a scope sync output independent of the motor speed, so I can look at the current waveforms:

3018 X – Fast – 12V – 140mm-min 1A-div

The alert reader will note the pulse occurs on the down-going side of the waveforms, which means I have the current probes clipped on backwards or, equivalently, on the wrong wire. The point is to get a stable sync, so it’s all good no matter which way the current goes.

2019-09-11

CNC 3018-Pro: LM6UU Linear-bearing Diamond Drag Bit Holder

The CNC 3018-Pro normally holds a small DC motor with a nicely cylindrical housing,so this was an easy adaptation of the MPCNC’s diamond drag bit holder:

CNC 3018-Pro - Diamond bit - overview — CNC 3018-Pro – Diamond bit – overview

The lip around the bottom part rests atop the tool clamp, with the spring reaction plate sized to clear the notch in the Z-axis stage.

The solid model looks about like you’d expect:

Diamond Scribe - Mount - solid model — Diamond Scribe – Mount – solid model

The New Thing compared to the MPCNC holder is wrapping LM6UU bearings around an actual 6 mm shaft, instead of using LM3UU bearings for the crappy diamond bit shank:

CNC 3018-Pro - Diamond bit - epoxy curing — CNC 3018-Pro – Diamond bit – epoxy curing

I cut the shank in two pieces, epoxied them into 3 mm holes drilled into the 6 mm shaft, then epoxied the knurled stop ring on the end. The ring is curing in the bench block to stay perpendicular to the 6 mm shaft.

The spring constant is 55 g/mm and it’s now set for 125 g preload:

CNC 3018-Pro - Diamond bit - force measurement — CNC 3018-Pro – Diamond bit – force measurement

A quick test says all the parts have begun flying in formation:

CNC 3018-Pro - Diamond bit - test CD — CNC 3018-Pro – Diamond bit – test CD

It’s definitely more rigid than the MPCNC!

The OpenSCAD source code as a GitHub Gist:

	// Diamond Scribe in linear bearings for CNC3018
	// Ed Nisley KE4ZNU – 2019-08-9

	Layout = "Build"; // [Build, Show, Base, Mount, Plate]

	/* [Hidden] */

	ThreadThick = 0.25; // [0.20, 0.25]
	ThreadWidth = 0.40; // [0.40, 0.40]

	/* [Hidden] */

	Protrusion = 0.1; // [0.01, 0.1]

	HoleWindage = 0.2;

	inch = 25.4;

	function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);

	ID = 0;
	OD = 1;
	LENGTH = 2;

	//- Adjust hole diameter to make the size come out right

	module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
	Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
	FixDia = Dia / cos(180/Sides);
	cylinder(r=(FixDia + HoleWindage)/2,h=Height,$fn=Sides);
	}

	//- Dimensions

	// Knife holder & suchlike

	ScribeOD = 3.0; // diamond scribe shaft

	Bearing = [6.0,12.0,19.0]; // linear bearing body, ID = shaft diameter

	Spring = [4.5,5.5,3*ThreadThick]; // compression spring around shaft, LENGTH = socket depth
	//Spring = [9.5,10.0,3*ThreadThick]; // compression spring around shaft, LENGTH = socket depth

	WallThick = 4.0; // minimum thickness / width

	Screw = [3.0,6.75,25.0]; // holding it all together, OD = washer

	Insert = [3.0,5.0,8.0]; // brass insert
	//Insert = [4.0,6.0,10.0];

	Clamp = [43.2,44.0,34.0]; // tool clamp ring, OD = clearance around top

	LipHeight = IntegerMultiple(2.0,ThreadThick); // above clamp for retaining

	BottomExtension = 25.0; // below clamp to reach workpiece

	MountOAL = LipHeight + Clamp[LENGTH] + BottomExtension; // total mount length
	echo(str("Mount OAL: ",MountOAL));

	Plate = [1.5ScribeOD,Clamp[ID] – 02*WallThick,WallThick]; // spring reaction plate

	NumScrews = 3;
	ScrewBCD = Bearing[OD] + Insert[OD] + 2*WallThick;

	echo(str("Retainer max OD: ",ScrewBCD – Screw[OD]));

	NumSides = 9*4; // cylinder facets (multiple of 3 for lathe trimming)

	// Basic mount shape

	module CNC3018Base() {

	translate([0,0,MountOAL – LipHeight])
	cylinder(d=Clamp[OD],h=LipHeight,$fn=NumSides);
	translate([0,0,MountOAL – LipHeight – Clamp[LENGTH] – Protrusion])
	cylinder(d=Clamp[ID],h=(Clamp[LENGTH] + 2*Protrusion),$fn=NumSides);
	cylinder(d1=Bearing[OD] + 2*WallThick,d2=Clamp[ID],h=BottomExtension + Protrusion,$fn=NumSides);

	}

	// Mount with holes & c

	module Mount() {

	difference() {
	CNC3018Base();

	translate([0,0,-Protrusion]) // bearing
	PolyCyl(Bearing[OD],2*MountOAL,NumSides);

	for (i=[0:NumScrews – 1]) // clamp screws
	rotate(i*360/NumScrews)
	translate([ScrewBCD/2,0,MountOAL – Clamp[LENGTH]])
	rotate(180/8)
	PolyCyl(Insert[OD],Clamp[LENGTH] + Protrusion,8);
	}

	}

	module SpringPlate() {

	difference() {
	cylinder(d=Plate[OD],h=Plate[LENGTH],$fn=NumSides);

	translate([0,0,-Protrusion])
	PolyCyl(Plate[ID],2*MountOAL,NumSides);

	translate([0,0,Plate[LENGTH] – Spring[LENGTH]]) // spring retainer
	PolyCyl(Spring[OD],Spring[LENGTH] + Protrusion,NumSides);

	for (i=[0:NumScrews – 1]) // clamp screws
	rotate(i*360/NumScrews)
	translate([ScrewBCD/2,0,-Protrusion])
	rotate(180/8)
	PolyCyl(Screw[ID],2*MountOAL,8);
	}

	}


	//—–
	// Build it

	if (Layout == "Base")
	CNC3018Base();

	if (Layout == "Mount")
	Mount();

	if (Layout == "Plate")
	SpringPlate();

	if (Layout == "Show") {
	Mount();
	translate([0,0,1.25*MountOAL])
	rotate([180,0,0])
	SpringPlate();
	}

	if (Layout == "Build") {

	translate([0,-0.75*Clamp[OD],MountOAL])
	rotate([180,0,0])
	Mount();
	translate([0,0.75*Plate[OD],0])
	SpringPlate();
	}

view raw Diamond Scribe.scad hosted with ❤ by GitHub

2019-09-10

Category: Machine Shop

CNC 3018-Pro: DRV8825 Drivers at the Edge of Madness

Mailbox Door Rebuild

Schwalbe Marathon Plus and Michelin Protek vs. Glass Chip

CNC 3018-Pro: Milling the CD Fixture

CNC 3018-Pro: Tape-Down Platter Fixture

DRV8825 Stepper Driver: Adding a Home Output

CNC 3018-Pro: LM6UU Linear-bearing Diamond Drag Bit Holder