The ultimate Cox .049 reset tool :)

Master toolmaker from our small-town machine shop. Everything by hand; they have no CNC machines.

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

First of April?
How would that work without a slot for the conrod? Doh

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.

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?

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.

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.

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. I wouldn't be surprised if L.M. Cox didn't have a similar set-up. Kudos to your machinist!

That's slick Bernie. Any chance of doing cylinders too?

Dave P. wrote:That's slick Bernie.  Any chance of doing cylinders too?

custom port-grinding..

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.

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.

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.

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.

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.

That's pretty reassuring.