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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:

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  1. #1 by RCPete on 2019-09-12 - 16:37

    For what it’s worth, there’s a chance mail costs from the usual eBay suspects might go up: https://www.freightwaves.com/news/us-to-leave-global-postal-union-next-month

    Apparently, US subsidies for foreign shipping have been out of line, and this could impact parcel post rates for small packages.

    • #2 by Ed on 2019-09-13 - 10:25

      If it helps get rid of the absolute bottom dollar sellers, I’m all for it.

      I’ve been paying a few bucks more to “US Sellers”, which seem to be US-based front offices / reshippers of Chinese sources: the eBay seller name (a friendly ‘Murrican string) rarely matches the PayPal biller name (generally a set of Chinese characters).

      Tracking down the physical mailing addresses suggests they’re parceling a containerload of assorted stuff, so foreign-postage increases may not matter.

      Tariffs, on the other paw, should definitely apply and, if the eBay / Aliexpress pool get vacuumed, I’ll call ’em a net win.

  1. CNC 3018-Pro: Milling the CD Fixture | The Smell of Molten Projects in the Morning

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