Re: [CAD_CAM_EDM_DRO] Re: Stainless tubing

Just as an asside, the straightest rifle barrels in the world are bored in
India, and command a high price. What do they use to bore them out? A manual
shift car transmission with a tool on one end, and a hand crank on the other...

Bill

On Wed Jan 2 18:12:50 2002, dave_ace_me, <davemucha@...> wrote:

>Hi Smoke,
>
>I thought of that, but the thought of spending
>an hour drilling a 2 ft lenght just was too much.
>
>Since the bore is not critical the long hole would
>not be a problem.
>
>but, I need to locate one bearing in the center, and one on one end,
>with a 10 inch projection. That means turing almost a foot of the OD.
>
>Since I'm just a little busy or lazy (depending on whom you talk to)
>I'd probably send it out to get center ground for a perfect finish.
>
>Dave
>
>
>
>--- In CAD_CAM_EDM_DRO@y..., "Smoke" <smoke@t...> wrote:
>> I'd do it on a lathe.
>> First I'd mount the part between centers and turn a short section
>on each
>> end.
>> Then I'd mount the part in a four jaw chuck, supporting the other
>end on the
>> tailstock center (with the steady rest installed but not touching
>the part)
>> and adjust the chuck to center the part =/- .001. Then I'd set up
>the
>> steady rest and drill the thru hole to a size just below the final
>diameter.
>> After that I'd bore one end, turn the part around, re-center and
>bore the
>> other end. This should give you a pretty accurate part. If there
>is a
>> shaft that supposed to fit the bores, you can always relieve the
>center area
>> to reduce friction (or install bearings).
>>
>> I used this technique to build a bolt action rifle receiver. It
>works good.
>>
>> BTW....in case (I forget who) wants to know...yeah, there's no such
>word as
>> "thru" either but it's been used in engineering for many many
>> years...irregardless! :-)
>>
>> Smoke
>>
>> > I've been trying to find stainless tubing with
>> > a heavy wall, 0.75" OD , 0.1" wall or more, but have had no luck.
>> >
>> > I only need an 18 inch long piece, but am wary of
>> > trying to drill that length.
>> >
>> > I need to use this in a couple of pillow block bearings so OD
>> > dimmention is important.
>> >
>> > McMaster sells ground hollow shafting , but they start at 1.5
>inches
>> > OD.
>> >
>> > can anyone point me in the proper dirrection ?
>>
>> > Dave

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