Replacing some PVC with Delrin - more clearance under Z

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Replacing some PVC with Delrin - more clearance under Z

Postby jblakey » Mon Jul 18, 2016 8:29 am

Hi guys,

finished up another change on my 7x12 over the weekend. Made a new backer plate for the Z-axis assembly to give me more clearance under the Z axis, and also cut a new spindle attachment plate (I previously had two plates here - the original plus an adapter plate for my Sable spindle). Made the two of them out of 3/8 Delrin. Delrin is supposed to be more rigid than PVC - it's certainly more dense, and it machined nicely with my 2 flute wood/plastic endmills. It costs about double, though. On another positive note, the chips aren't electro-static like ABS ones are:)

Much happier with the slightly raised z-axis, and most of my bits can still reach the table surface.

Thanks,
jason
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby jblakey » Thu Jul 21, 2016 4:51 pm

Also, went out and bought some 1" cap-head sheet metal #4 screws to replace the 3/4" ones to make up for the thicker 3/8 Delrin. They worked great, and made up for the slight stripping I had going on in the z-axis attachment points.
Thanks,
jason
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby johntech » Fri Aug 19, 2016 10:17 pm

They make threaded inserts you can screw into the PVC or Delrin then you can use regular bolts to fasten the pieces together.

I noticed you have a different motor setup. How is that working out for you? Where did you pick it up and cost , if I may ask?

Nice setup!!

John
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby jblakey » Mon Aug 22, 2016 1:36 pm

Hi John,

thought about those inserts, but the holes are so small (especially the edge-on ones into the z-axis attachment uprights) that I didn't want to try that. I was thinking about replacing those with aluminum, but the longer screw has solved my problem (for now), and with the higher z-axis, I shouldn't need to unscrew the z-axis assembly any time soon.

The spindle is one of these, i ordered it on eBay for 118 USD (total):

http://www.ebay.com/itm/ER11-Spindle-fo ... FE8ycGHQ3A

A Sable 2015 spindle. I liked the design because it seems like it would be a lot more solid (Separate bearing and motor). I've had not a single problem with it. I run it on it's own 24v power supply. I've got the measurements for an attachment plate, if you get one and need them.

Thanks,
jason
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby Sha » Tue Aug 23, 2016 9:14 am

Nice setup Jason.

Can you tell me where you got the waste board *bed ?

I will be purchasing the sable spindle and will appreciate any help you can provide with wiring and template for attaching.

Sha.
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby jblakey » Wed Aug 24, 2016 8:21 am

Hi Sha,

made the bed - project is here:
http://community.zentoolworks.com/viewt ... 17&t=26503


wiring the sable spindle was easy - just feed it 24v at 5amps and it'll be happy. I bought a second hand PS for it (they're all over ebay). I wouldn't buy the cheapest new ones (again). The one I did lasted 1 minute before **fffzzzzzztttt** happened and the magic smoke escaped.


THanks,
jason
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby Sha » Wed Aug 24, 2016 10:22 am

Thank you Jason. Very helpful.

Will give it a try and report back.
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby myklhn » Thu Aug 25, 2016 6:58 pm

Quick couple of questions regarding the spindle: Have you measured the runout on it (or have specs)? How many bearings does it have?

Thanks,

Michael
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Re: Replacing some PVC with Delrin - more clearance under Z

Postby jblakey » Fri Aug 26, 2016 6:31 am

Hi Mike,

did a TIR check a few years ago, and back then it was .0009 inches, or .0229 mm.

Here's my original post:
viewtopic.php?f=11&t=26492&p=39100

I have no idea how many bearings it has:)

Thanks,
jason
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