Re: [CAD_CAM_EDM_DRO] How to you make a 1/8" collet on a 1/4" shaft

I don't have the part you seek, but there is one part of it available.

ROTOZIP makes an adaptor which is a 1/8" collet adaptor to fit into a 1/4"
collet. Female 1/8" to MaIe 1/4". I use this to adapt 1/8" tools to my
1/4" laminate trimmer.

I imagine that a 1/4" coupler is easier to come by (commercially or home-brew).

To check the claim I just made, I looked up "shaft coupler" on the
McMaster-Carr web site and found two possibilities, although they are not
rated for high enough RPM. The highest was 4000 RPM, so you might have a
balance problem.

-- Carl


At 06:28 PM 7/30/2003 +0000, you wrote:

>Hi everyone,
>I have not used this list in a while but when I did, I always got
>great answers. I have a situation. My mill needs a faster motor. So
>I rigged up a Dewalt Laminate trimmer motor to the top of my
>drawbar. I connected a 1/4 in shaft to the motor which runs down the
>drawbar hole(about 16" long). On the lower end (turret end) I
>installed a part that houses two high speed bearings in which the
>shaft runs through. Now sticking out the very bottom of the piece is
>a 1/4" high speed shaft about 1-1/2" long which needs colleting.
>
>The whole idea is so that I can CNC engrave using high speed engraver
>bits. I need to some how attach an 1/8" engraver bit to the 1/4"
>shaft. What I need (I think) is piece that has a 1/4 female collet
>on one end and an 1/8 female collet on the other. It can not be more
>that a couple of inches long. I have tried boring 1/4" and 1/8"
>holes in some round stock and use set screws to attach to the shaft
>and mount engraver bit. I works ok but it's very hard to get it all
>true at 30,000 rpms!
>
>Any thoughts or better yet can someone make me the part I seek?
>Dean
>
>
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