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by Levent Suberk Mon Aug 15, 2022 11:28 am
The ultimate Cox .049 reset tool :)
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The ultimate Cox .049 reset tool :)
Swags conrod into ball socket for the pistons and conrods we recently had made but also great for resetting. Three assemblies per minutes that include:
Note that the strike tool does not have a "slit" like the standard reset tool
Very few need a second "press" but that is what the turntable on bearings is for



- Putting piston in base
Dipping ball of conrod in oil
Putting conrod in piston
Swaging (one stroke)
Checking for proper "play"
Checking for uniform swag
Checking fit in cylinder
Note that the strike tool does not have a "slit" like the standard reset tool
Very few need a second "press" but that is what the turntable on bearings is for



Re: The ultimate Cox .049 reset tool :)
That definitely is the best design I have seen. I really like the fact that the conrod isn’t off to one side. Also very little chance of messing up.
Cribbs74- Moderator
Posts : 11849
Join date : 2011-10-24
Age : 48
Location : Tuttle, OK
Re: The ultimate Cox .049 reset tool :)
Master toolmaker from our small-town machine shop. Everything by hand; they have no CNC machines.
Re: The ultimate Cox .049 reset tool :)
Alright, time to leave the office and sit in the spa outside, overlooking the lake with a nice glass of something. Only 5 below right now, so hair probably will not freeze from the steam.
Speaking of hair, although hairdressers have been declared non-essential, booze and weed are essential services … gotta love that
Speaking of hair, although hairdressers have been declared non-essential, booze and weed are essential services … gotta love that

Re: The ultimate Cox .049 reset tool :)
First of April?
How would that work without a slot for the conrod? Doh
How would that work without a slot for the conrod? Doh

Surfer_kris- Diamond Member
- Posts : 1848
Join date : 2010-11-20
Location : Sweden
Re: The ultimate Cox .049 reset tool :)
look like gun cartrige maker machine very nice equipement would love workin for machinist to get trik from him
davidll1984- Diamond Member
- Posts : 1993
Join date : 2020-02-12
Age : 37
Location : shawinigan
Re: The ultimate Cox .049 reset tool :)
Not a prank …..
They first designed 5 or 6 different tools with the slot but found that one would have to do a minimum of 8-10 presses, each with increasing pressure, so that the wall of the socket did not tear where it mated with the slot.
They finally cut a piston in half and came up with a solid tool; whereas only one press is required. A bit flatter socket radius but absolutely functional and we have shipped over 300 of the new piston production.


They first designed 5 or 6 different tools with the slot but found that one would have to do a minimum of 8-10 presses, each with increasing pressure, so that the wall of the socket did not tear where it mated with the slot.
They finally cut a piston in half and came up with a solid tool; whereas only one press is required. A bit flatter socket radius but absolutely functional and we have shipped over 300 of the new piston production.


Re: The ultimate Cox .049 reset tool :)
Hu, I though the big end would be way too large in order for that to work...
Will you be making resetting tools this way now too?
Will you be making resetting tools this way now too?
Surfer_kris- Diamond Member
- Posts : 1848
Join date : 2010-11-20
Location : Sweden
Re: The ultimate Cox .049 reset tool :)
Bernie
Good to see a smooth accurate solution to get the piston assemblies together, up to 90 units per hour!
Thank you for sharing the process. Still seems like you would need a slot to get a proper setting of the
ball to socket.


Good to see a smooth accurate solution to get the piston assemblies together, up to 90 units per hour!
Thank you for sharing the process. Still seems like you would need a slot to get a proper setting of the
ball to socket.


Last edited by 1/2A Nut on Fri Apr 03, 2020 4:48 pm; edited 2 times in total
1/2A Nut- Top Poster
Posts : 3244
Join date : 2013-10-20
Age : 59
Location : Brad in Texas
Re: The ultimate Cox .049 reset tool :)
Surfer_kris wrote:Hu, I though the big end would be way too large in order for that to work...
Will you be making resetting tools this way now too?
Something to think about but not sure. Way too many other projects being chased after.
Re: The ultimate Cox .049 reset tool :)
1/2A Nut wrote:Bernie![]()
Good to see a smooth accurate solution to get the piston assemblies together, up to 90 units per hour!
Thank you for sharing the process. Still seems like you would need a slot to get a proper setting of the
ball to socket.![]()
It's actually 180 sets / hour

No slot at all required. Why would one want a slot in the first place? Ronald Valentine presses his pistons the same way.
Re: The ultimate Cox .049 reset tool :)
Cox International wrote:1/2A Nut wrote:Bernie![]()
Good to see a smooth accurate solution to get the piston assemblies together, up to 90 units per hour!
Thank you for sharing the process. Still seems like you would need a slot to get a proper setting of the
ball to socket.![]()
It's actually 180 sets / hour
No slot at all required. Why would one want a slot in the first place? Ronald Valentine presses his pistons the same way.
This thread made me smile.

Re: The ultimate Cox .049 reset tool :)
That's slick Bernie. Any chance of doing cylinders too?
Dave P.- Gold Member
Posts : 477
Join date : 2017-07-31
Age : 64
Location : Durham, NC
Re: The ultimate Cox .049 reset tool :)
Dave P. wrote:That's slick Bernie. Any chance of doing cylinders too?


Re: The ultimate Cox .049 reset tool :)
roddie wrote: I wouldn't be surprised if L.M. Cox didn't have a similar set-up.
You are probably right there.
In the past I have wondered why the piston part isn't well wrapped around the conrod ball from the factory. It seems to wrap around much better after using the (slotted) reset tool. Not sure what is best though, it might be easier for oil to get in there without having the piston part fully wrapped around the conrod ball.
Surfer_kris- Diamond Member
- Posts : 1848
Join date : 2010-11-20
Location : Sweden
Re: The ultimate Cox .049 reset tool :)
Dave P. wrote:That's slick Bernie. Any chance of doing cylinders too?
At some point in a few years perhaps. The reason we had 4,000 pistons made was because we have over 3,000 cylinders in stock (between Matt and us), so no point in having any made now.
Re: The ultimate Cox .049 reset tool :)
roddie wrote:Dave P. wrote:That's slick Bernie. Any chance of doing cylinders too?
custom port-grinding..
![]()
Ronald Valentine has been customizing cylinders for us for many years now.
Re: The ultimate Cox .049 reset tool :)
Surfer_kris wrote:roddie wrote: I wouldn't be surprised if L.M. Cox didn't have a similar set-up.
You are probably right there.
In the past I have wondered why the piston part isn't well wrapped around the conrod ball from the factory. It seems to wrap around much better after using the (slotted) reset tool. Not sure what is best though, it might be easier for oil to get in there without having the piston part fully wrapped around the conrod ball.
Not meaning to argue but, IMO, an un-slotted version is superior.
Re: The ultimate Cox .049 reset tool :)
That's pretty reassuring.Cox International wrote:Dave P. wrote:That's slick Bernie. Any chance of doing cylinders too?
At some point in a few years perhaps. The reason we had 4,000 pistons made was because we have over 3,000 cylinders in stock (between Matt and us), so no point in having any made now.
Dave P.- Gold Member
Posts : 477
Join date : 2017-07-31
Age : 64
Location : Durham, NC

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