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Cox .020 cylinder tap 25/64-48 Empty Cox .020 cylinder tap 25/64-48

Post  Jason_WI Tue May 05, 2020 5:42 pm

Looking to see where one might find one of these odd ball taps. 25/64-48 or referred as 0.390-48 UNS 3A.

Is the Pee Wee crank shaft diameter equal to 4mm or is it slightly bigger?



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Post  EXModelEngines Tue May 05, 2020 6:44 pm

Jason_WI wrote:Looking to see where one might find one of these odd ball taps. 25/64-48 or referred as 0.390-48 UNS 3A.

Is the Pee Wee crank shaft diameter equal to 4mm or is it slightly bigger?




I can have one of my tooling shops quote for you, but will likely cost between $50-$60 and that is if we take a few.

PW crank is larger than 4mm
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Post  Jason_WI Tue May 05, 2020 7:01 pm

Matt,

This project probably won't happen so I wouldn't want to have you have extra taps no one else would buy. I have an inquiry into Newman tools in CT about a tap.

Do you happen to know the exact size of the PW crankshaft?

Seems like Cox pulled random numbers out of a hat for crankshaft sizes. I'm sure some engineering calculations went into it and never thought of standard bearing race sizes available at the time.
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Post  Dave P. Tue May 05, 2020 10:16 pm

Whatcha workin on Jason? Sounds interesting...
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Post  Jason_WI Tue May 05, 2020 11:07 pm

Probably a big waste of time. I have my doubts it will work. Don’t want to mention anything just yet.
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Post  EXModelEngines Wed May 06, 2020 7:25 am

Jason_WI wrote:Matt,

This project probably won't happen so I wouldn't want to have you have extra taps no one else would buy. I have an inquiry into Newman tools in CT about a tap.

Do you happen to know the exact size of the PW crankshaft?

Seems like Cox pulled random numbers out of a hat for crankshaft sizes. I'm sure some engineering calculations went into it and never thought of standard bearing race sizes available at the time.

Let me look it up and will let you know if I have it.

Newman is a good outfit - very familiar with those guys.
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Post  1/2A Nut Wed May 06, 2020 10:12 am

If your doing what I think you are it will work that carbon can handle the heat, ceramic bearings
should stay put less heat.  Remember Testers had a run of plastic crankcases back in the day.

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Post  Jason_WI Wed May 06, 2020 2:31 pm

Single tap cost is $230. Sad

I don’t think I will move forward with this idea.
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Post  1/2A Nut Wed May 06, 2020 7:51 pm

I will donate $115 towards a .020 tap!

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