What process would you recommend to cut parts out of 1 inch thick delrin or nylyoil (oil filled nylon)
The part I need to cut are bushings. 15mm OD 8mm ID 25 mm long.
I don’t have the hAAS cert. I’ve read laser is doable with Delrin, not so with Nyloil, but it is finicky. Maybe the small table cnc miller?
The “EMCO” mill doesn’t have a training requirement. If you are familiar with LinuxCNC, it should be easy to jump right in.
If you’re making round bushings, the lathe could be a good choice as well.
If you can get it in rod form I’d use the lathe.
Funny, I didn’t think of the lathe. However, for making a bunch of them, the sheet stock on cnc is probably more efficient…
The lathe will knock them out much quicker and easier.
Throw your bar stock in the machine, drill and ream the ID, turn down the OD, cut to length.
Just remember when turning down the OD of plastic material to work fairly close to the chuck because your material will try to push off from the cutter.
Yeah, I’m kinda liking the lathe idea.
So, should if I have square stock, advisable to knock down the corners on the bandsaw first? At least that’s how I remember it back when I learnt the lathe…
Seems like a good idea to me. I’m not sure how the inserts will take to being hammered by irregular stock, even if it is plastic. Is Delrin not available in rod form?
It’s definitely available in round stock if he hasn’t already bought material.
I’m no machinist but given that delrin is plastic and slippery, it might be
hard to hold in the chuck without compressing it. Maybe make some sort of
jig to hold it in the chuck? Or do you think it would be fine in the chuck?
I was a machinist for 7 years, mostly on manual mills and lathes.
It’ll be totally fine in the chuck. As always, just don’t try to take too much material in one cut.
I guess I should research before I speak, but what fun would that be.
These guys have some good input
Practical Machinist
http://www.practicalmachinist.com/vb/cnc-machining/machining-delrin-173503/
On Mon, Mar 30, 2015 at 8:31 PM, Joseph Helmstetter Jr <
[email protected]> wrote:
I don’t know. That may be an issue. I can’t think of a way to make a jig that’s any more secure than the chuck.
After you bore it, you can use a live center on the tailstock to hold it in place. If you’re worried about the live center damaging the bushing, use a wooden sphere between the delrin and the live center. It will turn in the delrin and yet the center will hold it in place.
Chris
I was wondering the other day… does DMS have a tabletop chuck or any V-blocks for working with round stock on the mills?
If not, it would make life much easier than always machining soft jaws to hold round parts.
We have a set of v-blocks.
Yep, i read that very same post earlier today…
I had already bought a small sample of stock, so i will mess around with it on the lathe when it arives.
Thanks for the tips!
Mark
The EMCO mill has considerable backlash. It probably wouldn’t be able to produce usable bearings in it’s current state. It may have adjustments that can be made to reduce the backlash (I haven’t taken it apart to check).
Too bad about the EMCO backlash… Can it be fixed or compensated out in software?
I also read that you should not use the same cutting tools on Deleon that you use on metal because it leaves a coating on the tool…so do I buy my own bits for the lathe or something?
I haven’t had any backlash issues on the emco and neither have two people who used it recently. The info @lukeiamyourfather had may be out of date.
