Lockdown turntable and lathe - a DIY project

[A1beats]

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The lathe, with the 'coin exciter' head mounted on its transport mechanism. When the head is fully lowered on to the disc, the stylus is at a very slight trailing angle (2 - 4 degrees from vertical).
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Close-up of head transport. The counterweight is a collection of 'penny washers' held in place by two 6mm collars.

This post brings the 'project report' up to date (7 May) - I'll document my work henceforth in subsequent posts to this thread. Thanks to KNOP and Grooveguy in particular for their careful documentation of their own projects, and for making their findings public!

David

Hi David, Could u share info where u got the motor and linear pulley's and belt?
Thanks

Arnold

[pentlandsound]

Hi Arnold,

Here's some places where you might find what you require:

Pulleys: https://www.motionco.co.uk/grooved-pulley-20mm-round-belt-p-458.html
Depending on the diameter of the shafts of your linear rail and motor, you may need either or both of these:
https://www.motionco.co.uk/bore-reducer-bore-10mm-long-p-427.html
https://www.motionco.co.uk/bore-reducer-bore-10mm-long-p-430.html

Belts: https://www.ebay.co.uk/itm/394808486184
Endless 'O-rings' seem to work best. I don't think this was the exact listing on eBay, but it's very similar. You need a belt to fit your pulleys (3 mm CS), with the ID/OD (inner/outer diameter) chosen depending on how far apart your linear rail and motor are. Hint: don't make the belt too tight.

Motor: I have a Jugetek stepper, model 14HY0007-20B. I chose a NEMA-14 motor because it's fairly compact and sits more or less flush with the V-Slot rail, but there's no real reason that you couldn't use a NEMA-17 one - they are more common and easier to find.

Hope this helps!

David