On Tue, 11 Feb 2014 01:06:47 -0800 (PST), robobass
wrote:

I have a lathe but no mill. I'm looking at getting a tabletop 3 axis trammel CNC, which I think will be cheaper and more useful for me than a knee mill, but I have a project which would require a lot of collet slotting in delrin, and this machine seems not the best choice. I feel like I've seen a dedicated machine, but don't remember where. Also, I'm wondering if some sort of sharpening machine could be adapted.
Thanks!

Burke or Nichols hand feed mill? These have a lever with rack & pinion
instead of a hand crank and lead screw for the longitudinal feed.

http://www.thekilmerplace.com/mill%20done%20001.JPG
http://www.practicalmachinist.com/vb...t-head-210534/

--
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Thanks, but I'm looking for something much smaller, cheaper, and lighter!

On Tue, 11 Feb 2014 07:12:42 -0800 (PST), robobass
wrote:

Thanks, but I'm looking for something much smaller, cheaper, and lighter!

I just gave you some photos so you can understand how to concept
works. Im sure you can figure out how to do it cheaper.smaller and
lighter


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"Ned Simmons" wrote in message
...
On Tue, 11 Feb 2014 01:06:47 -0800 (PST), robobass
wrote:

I have a lathe but no mill. I'm looking at getting a tabletop 3 axis
trammel CNC, which I think will be cheaper and more useful for me than a
knee mill, but I have a project which would require a lot of collet
slotting in delrin, and this machine seems not the best choice. I feel
like I've seen a dedicated machine, but don't remember where. Also, I'm
wondering if some sort of sharpening machine could be adapted.
Thanks!

Burke or Nichols hand feed mill? These have a lever with rack & pinion
instead of a hand crank and lead screw for the longitudinal feed.

http://www.thekilmerplace.com/mill%20done%20001.JPG
http://www.practicalmachinist.com/vb...t-head-210534/


There's also the Barker mill, which uses 3c collets for a max capacity of
1/2" and takes up very little space.

http://www.lathes.co.uk/barkermiller/

--
Ned Simmons

On 2014-02-11, Ned Simmons wrote:
On Tue, 11 Feb 2014 01:06:47 -0800 (PST), robobass
wrote:

I have a lathe but no mill. I'm looking at getting a tabletop 3 axis
trammel CNC, which I think will be cheaper and more useful for me than a
knee mill, but I have a project which would require a lot of collet
slotting in delrin, and this machine seems not the best choice. I feel
like I've seen a dedicated machine, but don't remember where. Also, I'm
wondering if some sort of sharpening machine could be adapted.

Thanks!

Burke or Nichols hand feed mill? These have a lever with rack & pinion
instead of a hand crank and lead screw for the longitudinal feed.

Agreed. I've got a Nichols horizontal mill, and that is what I
would use (with an index head, or perhaps a makeshift one for just this
task). But I'm not sure how easy that will be for robobass to get. I
think that he's in Germany? There may be equivalent machines there, but
probably not many by those two names. they are not exactly light for
shipping. My Nichols was something like 1100 LBs (make that about 500
kg)

Note that some of the Nichols mills (in particular, the
"toolroom" model) have the choice of a lever feed for the X axis, or a
leadscrew with a half-nut which drops by removing a screw, and allowing
it to hang from a stripper bolt while you put the other bolt back in
place. And yes, I use it in both formats from time to time.

It comes with a three phase motor, and mine at least is 240 VAC,
so I don't know whether that would be a problem as well. But it runs
slow enough so overheating the Delrin would not be a problem.

You probably want support for the Delrin -- plan on an arbor
inside it as well as the grip on the taper. And before you make the
actual runs, run the saw to cut grooves in the arbor (and make sure that
your index system will always use the same arbor positions.

If you were to do it on the lathe, I would suggest a
modification of the usual milling attachment which replaces the
compound. You want at least one axis with lever feed instead of
leadscrew so you don't crank forever on the cuts.

Good Luck,
DoN.

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