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

On Wed, 30 Jul 2003 20:55:18 -0000, you wrote:

>Dave,
>
>Ok colleting the shaft end is a pretty good idea but...and I have
>thought of this..how in the heck can I guarantee that I can ream an
>1/8" hole perfectly centered in a 1/4" shaft. I have have a pretty
>rigid lathe and have center drills, of course, but I have found that
>sometimes my holes can get off center. At 30,000 rpms, this might
>produce vibes. Maybe you can suggest a lathe technique that will
>guarantee centerness of my hole. I guess I can use the same idea when
>threading the shaft as well. Probably not as critical but may lower
>vibrations.

Boring bar. You make a very small one.
Also center the work precisely in a 4 jaw chuck.

ought to get you close.

Harvey

>
>Thanks
>Dean
>
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
><davemucha@j...> wrote:
>> I think the simple answer is to put the whole collet thing on the
>end
>> of your spindle.
>>
>> drill and ream for the 1/8 shaft
>> thread the OD for some fine thread
>> put a taper on the end of the shaft of 45 degrees or so.
>>
>> Make a nut with the same thread and also put a matching taper in
>the
>> nut.
>>
>> slit the shaft well into the threads.
>>
>> when you put the nut on, your nut will compress the taper locking
>in
>> your engraver bit.
>>
>>
>> another idea is to take a 1/2 dia block and ream it to be a press
>fit
>> on the shaft and make a collet end much like a router. these can
>be
>> pretty simple to do, but you need access to a lathe.
>>
>> I made a few collets for my trim router and they came out pretty
>> nice. the drills did not spin in any material (yet) so I'm happy
>> with the do-it yourself collets.
>>
>> Dave
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "deansala" <adsala@p...>
>> 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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