Tag: Repairs

If it used to work, it can work again

HON Lateral File Cabinets: Rekeying

You’d hope the original owner would tape a key inside each file cabinet before donating it to charity; ours arrived unlocked and without keys. Fortunately, eBay sellers have All The Keys and I ordered replacement keys for each cabinet.

One pair of new keys fit into their lock, but the shoulder didn’t seat properly and the key didn’t turn:

HON Lateral File – 125E key insertion

Compared with a key for the other cabinet (on the bottom), it seems the tip profile wasn’t quite the same:

HON Lateral File – 125E key tip

Perhaps the underside of the tip hadn’t been cut? Stacking the two keys makes it even more obvious:

Key 125E tip shaping – vs Key 101E

The eBay seller suggested the lock cores have changed over the years, as other (unaltered) keys fit current cabinet locks. Perhaps HON used fussy high-quality lock cores back in 2004 when they built these cabinets.

I gingerly filed the 125E key’s tip to match the 101E key and, after several iterations, the shoulder seated firmly in the lock and the core turned smoothly. Flushed with success, I marked the other key of the pair, filed to the mark, and it worked on the first try.

Mary doesn’t plan to store any secret fabrics in her new cabinets, but now I can declare victory and move on.

2020-03-03

HON Lateral File: Shelf Rebuild

After sliding the HON Lateral File Cabinet shelf into place and installing the bumpers, it seemed rather loose and floppy. Comparing the situation with the other file cabinet showed it had a missing glide button in the rear and two missing slides at the front.

A replacement button emerged from the end of a Delrin rod:

The original buttons had an expanding stem, which is easy to do with an injection-molded part. I opted for simple adhesive, with enough of a blob underneath the shelf to (presumably) lock it in place forevermore:

The slides required an iterative design technique (pronounced “fumbling around”), because nothing on either side remained square / plumb / true / unbent. I hacked the first version from scrap acrylic, broke off anything that didn’t fit, and got better measurements from what remained:

HON Lateral File - shelf front guide - size test — HON Lateral File – shelf front guide – size test

With those measurements in hand, the second version used a pair of weird flat-head shoulder screws (probably from a hard drive) to anchor 3D printed angle brackets into the frame:

HON Lateral File - shelf slides - version 2 — HON Lateral File – shelf slides – version 2

Those worked reasonably well, but PETG doesn’t produce a nice sliding surface, so the final version has flat-head Delrin studs in slightly tweaked brackets:

HON Lateral File - shelf slides - version 3 — HON Lateral File – shelf slides – version 3

As with the buttons in the back, the original slides had expanding studs holding them in place, but glue works fine here, too:

HON Lateral File - shelf slides - version 3 - installed — HON Lateral File – shelf slides – version 3 – installed

The button isn’t quite square to the surface and the slide isn’t quite flush with the bent metal in the frame, but it’s Good Enough™ for a shelf that won’t get lots of mileage.

For reference, the brackets should print vertically to wrap the plastic threads around the upright for better strength:

HON Lateral File Shelf Slide - Slic3r — HON Lateral File Shelf Slide – Slic3r

If you did it the obvious way, the upright side would break right off at the first insult from the hulking shelf, although they’re basically a solid chip of plastic, with a little infill inside the bottom slab.

While I was at it, I pulled the springs to make them a bit longer, so they touch the back of the frame when the shelf is half an inch behind the front face of the drawers. A firm push and those Delrin contact points let the shelf pop out an inch or so, with plenty of room for fingers underneath the front edge.

Some drawer slide stops near the back needed attention, too:

HON Lateral File - slide stop bumper - bent — HON Lateral File – slide stop bumper – bent

I cannot imagine how hard somebody slammed the drawers, because bending the stops back to a right angle required a Vise-Grip and some muttering:

HON Lateral File - slide stop bumper — HON Lateral File – slide stop bumper

Oddly, the cushiony hollow side faces away from the drawer, toward the back of the frame, because putting it forward holds the drawer front proud of the front frame face. Maybe HON cost-reduced the steel slides by making them just slightly shorter and using the same bumpers?

The drawers have begun filling up from boxes scattered around the house:

HON Lateral File - fabric stash — HON Lateral File – fabric stash

That’s the “orange” part of Mary’s collection, now with plenty of room to grow!

The OpenSCAD source code as a GitHub Gist:

	// HON Lateral File Cabinet
	// Shelf slides
	// Ed Nisley KE4ZNU 2020-02-25

	//- Extrusion parameters must match reality!
	// Print with 3 shells and 3 solid layers

	ThreadThick = 0.25;
	ThreadWidth = 0.40;

	HoleWindage = 0.2;

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

	Protrusion = 0.1; // make holes end cleanly

	inch = 25.4;

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


	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

	SlideBlock = [18.0,25.0,12.0]; // across, along, height of left shelf bracket

	SlideWalls = [1.0,-SlideBlock.y/2,2.0]; // wall thicknesses, dummy Y

	HoleOffset = [8.4,7.0,0]; // hole center from left, front, dummy Z
	HoleOD = 4.0;

	Screw = [4.0,10,0.8]; // weird flat-head shoulder screw

	ScrewRecess = Screw.z + 2*ThreadThick; // depth to keep head below slide surface

	echo(str("Head base: ",SlideWalls.z – ScrewRecess));

	$fn = 12*4;

	//——————-
	// Single slide

	module Slide() {

	difference() {
	cube(SlideBlock,center=false);

	translate(SlideWalls)
	cube(SlideBlock * 2,center=false);

	translate(HoleOffset – [0,0,SlideBlock.z/2])
	rotate(180/8)
	PolyCyl(HoleOD,2*SlideBlock.z,8);

	translate(HoleOffset + [0,0,SlideWalls.z] – [0,0,ScrewRecess])
	rotate(180/12)
	PolyCyl(Screw[OD],3*Screw[LENGTH],12);
	}

	}



	//——————-
	// Build them

	Gap = 5.0/2;

	translate([0,-Gap,0])
	rotate([90,0,0])
	Slide();

	translate([0,Gap,0])
	rotate([-90,0,0])
	mirror([0,1,0])
	Slide();

view raw HON Lateral File Shelf Slides.scad hosted with ❤ by GitHub

2020-03-02

HON Lateral File Cabinet Shelf Bumper Replacement

Somewhat to our surprise, our “new” HON Lateral File Cabinets include a pop-out shelf:

HON Lateral File – shelf – closed

The trick: push the bar inward against fairly stiff spring pressure, release it suddenly, watch it pop out maybe half an inch, get some fingers under the front edge, then pull it outward:

HON Lateral File – shelf – extended

Obviously, opening the drawer above the shelf will sweep whatever you put there onto the floor and opening the drawer below seems futile. I suppose it produced a bullet item on the features list.

Note that the topmost “drawer” is also called a “shelf”, because the front cover slides up-and-inward to reveal the contents. Should you stand eight feet tall, you might be able to look down on that shelf, but we mere mortals barely see its contents at eye level.

Dismantling the cabinets preparatory to deep cleaning revealed a pair of rubber bumpers along the rear edge of the shelf:

HON Lateral File – shelf bumper – installed

The slightly angled front side of the bumper (on the right) collides with a crossbar below the drawer just above it, preventing you from pulling the shelf entirely out of the cabinet.

Remove the bumper by pressing down and rearward (to the left), shoving the protruding lip into the slot with a thumb / screwdriver, then pull it upward through the slot:

HON Lateral File – shelf bumper – removed

The second cabinet had only one bumper, so I traced it twice onto a rubber sheet half as thick as the OEM bumper, bandsawed the shapes, and introduced them to Mr Belt Sander for cleanup:

HON Lateral File – replacement shelf bumper

Jammed side-by-side into the slot, they’ll serve the purpose:

HON Lateral File – replacement shelf bumper – installed

As with the replacement foot on the first cabinet, they’re not the prettiest things you’ve ever seen, but Mary doesn’t expect to use the shelf and they’ll never actually bump into anything.

Even the Pixel phone’s HDR image processing has trouble dealing with dark gray objects on a black background in dim light …

2020-02-26
Refrigerator Coil Wand Adapter Rebuild
After five years, the adapter between the Kenmore Progressive vacuum cleaner and the long wand required to reach inside the refrigerator evaporator coils broke at the latch opening:

$Kenmore Vacuum - refrigerator coil adapter - fracture$
Kenmore Vacuum – refrigerator coil adapter – fracture

A quick fix let me continue the mission:

Kenmore Vacuum – refrigerator coil adapter – temporary fix

A better fix required a few minutes of OpenSCAD tweakage and a few hours of hands-off build time:

Refrigerator Coil Wand Adapter – Slic3r preview

The fitting ID is now 2 mm smaller, the 3D honeycomb infill is 25%, and (contrary to the picture) it now has 4 perimeter threads. It’s a two-line change from the last time:
```
OEMTube = [35.0 - 2.0,35.0,41.7,40.5,30.0];           // main fitting tube
… then, inside MaleFitting() …
cylinder(d1=OEMTube[ID2],d2=OEMTube[ID1],h=2*OEMTube[LENGTH] + 2*Protrusion);
```
Those will propagate to anything I build from now on, although this is the first latch fracture.

Gotta love it when 3D printing lives up to the hype!
2020-02-25
HON Lateral File Cabinet Foot Repair

We bought the best-looking (pronounced “least bashed”) pair of hulking five-drawer industrial-strength HON Brigade Lateral File Cabinets from the local ReStore outlet’s assortment for Mary’s quilting fabric stash. They came with a steep discount, barely fit inside the Forester, caused minor interior trim damage, and should organize her entire stash.

One cabinet lost a foot nut at some point in its 16 year history:

HON Lateral File – foot hole – weld nugget filed

The surviving foot nuts sported two weld nuggets apiece:

HON Lateral File – OEM front foot

The hole had the remains of one nugget at the top left and looks like a manufacturing defect to me. Of course, we’re (at least) the second owners and the usual lifetime warranty no longer applies.

I can fix that.

Bandsaw a 1×¾ inch rectangle from 3/8 inch aluminum plate to match the surviving foot nut (which is steel, but aluminum will suffice for our needs). Break the edges, clamp in the Sherline, and mill a square protrusion to match the square-ish hole:

HON Lateral File – square nut – rough cut

Drill a 17/64 inch hole (looser than the nominal F drill, because I’m a sissy) for a flat-head bolt from the Drawer o’ 3/8-16 Bolts, tap, and clean up.

A trial fit showed the nugget had to go before the nut would come even close to fitting flat into the hole:

HON Lateral File – foot hole – grinding

The sheet metal around the hole had absorbed at least one mighty blow pushing the entire surface inward behind the front edge. To compensate, recess the nut’s front edge and slope the sides with a Dremel wheel to let the bottom face sit level:

HON Lateral File – square nut – taper grinding

Another trial fit showed the need for more recess:

HON Lateral File – square nut – deeper cut

Another spate of grinding made it sit mostly level on the decidedly non-level surface around the hole:

HON Lateral File – square nut – ready to install

The beveled corners fit inside the swaged hole corners.

Grind paint / crud off the sheet metal and roughen the surface for good epoxy griptivity:

HON Lateral File – foot hole – ready for install

Stand the cabinet top-side-down to make the bottom level. I wish the basement had one more course of block, but it’s not to be.

Butter the nut with JB Weld epoxy, plunk it in place, apply excess epoxy to make a fillet around the edges, apply duct tape to guy the top of the bolt level-ish, and let it cure:

HON Lateral File – square nut – epoxy curing

After the epoxy stiffened enough to hold its position, remove the bolt, file a crude ¼ inch hex, and saw a screwdriver slot to make it match the other feet:

HON Lateral File – new foot hex head

Not the fanciest job I’ve ever done, but it now behaves just like the other ones and it’s all good. The HON Storage Files FAQ points to a Troubleshooting Guide showing how to level the thing with a hex socket from inside the bottom drawer.

The flat heads on those bolts are basically 25 mm OD steel plates calling for fuzzy felt bumpers on the Sewing Room’s wood floors. When properly leveled, the front will be ⅛ inch higher than the rear. Although they suggest a pencil should roll toward the back, the top sheet metal on this one may be sufficiently warped to confuse the issue; I have a long level well suited to the task.

The original dimension doodle includes metric offsets for cutting with a ¼ inch end mill:

HON Foot nut – dimension doodles

All in all, a satisfying day in the Basement Shop …

2020-02-24
Frozen Fire Hydrant, One Year On

It seems reporting a frozen hydrant to the local fire company didn’t produce any meaningful action:

Frozen hydrant – Sheldon at Rt 376

We didn’t have any fires in the neighborhood where it might have been a problem, but I’ll try the water department this year …

Oddly, the water department repainted most of the fire hydrants along most of the roads last year. This one apparently didn’t qualify, for whatever reason, despite being only slightly off Rt 376 on Sheldon:

Frozen hydrant – Sheldon at Rt 376 – Google Streetview

When it’s not frozen, it’s not obvious …

2020-02-22
Drag Knife Blade Wear

Having used the same two drag knife blades intermittently over the last three-ish years, I wondered just how worn they’d gotten:

Drag Knife Blades – sides

For scale, the cylindrical part of the blade is 1.0 mm OD.

The blade with the longer face (left above and bottom below) has seen the most use and is definitely rounded at the tip:

Drag Knife Blades – tips

Three unused blades have sharp tips:

Drag Knife Blades – unused 60 45 30 degree

From the top, the (nominal) blade angles are 60°, 45°, and 30°, generally indicated by yellow, red, and blue plastic caps. However, various eBay sellers disagree on how to measure the angle (up from surface / outward from axis) and which cap colors correspond to which angles.

The unused 45° blade bracketed by the two used blades:

Drag Knife Blades – unused in center

The two lower blades have angles somewhere between 30° and 45°, suggesting slack grinder and QC tolerances. If the actual angle matters to you, buy an assortment (from one seller!), measure what you get, and don’t be surprised when the results aren’t anything in particular.

Perhaps, with careful attention to alignment in a non-pivoting / collet holder, one might scribe exceedingly narrow lines.

The microphotographic setup:

Drag Knife Blades – microscope stage setup

That’s the back of a sheet of carbon paper (remember carbon paper?), which is deep dark gray in normal light. It’s sitting on the sheet of 100 mil grid paper providing scale for small objects, atop the microscope stage positioner, with cold white illumination from an LED ring light.

Protip: even worn blades remain lethally sharp …

2020-02-21