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Cox Engine of The Month
September-2020
sosam117's
"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."
PAST WINNERS
sosam117's
"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."
PAST WINNERS
CEF Traveling Engine
Win This Engine!
Cox .020 cylinder tap 25/64-48
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Cox .020 cylinder tap 25/64-48
Jason_WI on 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?
Is the Pee Wee crank shaft diameter equal to 4mm or is it slightly bigger?
Jason_WI- Diamond Member
Posts : 2913
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Re: Cox .020 cylinder tap 25/64-48
EXModelEngines on 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
EXModelEngines- Platinum Member
Posts : 732
Join date : 2011-06-07
Location : Central CT, USA-
Re: Cox .020 cylinder tap 25/64-48
Jason_WI on 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.
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.
Jason_WI- Diamond Member
-
Posts : 2913
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Re: Cox .020 cylinder tap 25/64-48
Dave P. on Tue May 05, 2020 10:16 pm
Whatcha workin on Jason? Sounds interesting...
Dave P.- Gold Member
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Posts : 477
Join date : 2017-07-31
Age : 63
Location : Durham, NC
Re: Cox .020 cylinder tap 25/64-48
Jason_WI on 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.
Jason_WI- Diamond Member
-
Posts : 2913
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Re: Cox .020 cylinder tap 25/64-48
EXModelEngines on 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.
EXModelEngines- Platinum Member
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Posts : 732
Join date : 2011-06-07
Location : Central CT, USA -
Re: Cox .020 cylinder tap 25/64-48
1/2A Nut on 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.
should stay put less heat. Remember Testers had a run of plastic crankcases back in the day.
1/2A Nut- Diamond Member
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Posts : 2926
Join date : 2013-10-20
Age : 57
Location : Brad in Texas
Re: Cox .020 cylinder tap 25/64-48
Jason_WI on Wed May 06, 2020 2:31 pm
Single tap cost is $230. 
I don’t think I will move forward with this idea.
I don’t think I will move forward with this idea.
Jason_WI- Diamond Member
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Posts : 2913
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Re: Cox .020 cylinder tap 25/64-48
1/2A Nut on Wed May 06, 2020 7:51 pm
I will donate $115 towards a .020 tap!
1/2A Nut- Diamond Member
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Posts : 2926
Join date : 2013-10-20
Age : 57
Location : Brad in Texas
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