Howell V4 Water Pump -How to ?

[RobConway]

Hi, I really need some advice to bore out an eccentric pocket in this water pump body. I was looking for some suggestions as I am not sure what boring tool would be best to use to ensure a flat top/bottom with nice square corners ?'


I was thinking thus far.... create the stock on the lathe then drill the offset 1/4" through hole on the Mill. return to the lathe 4 jaw chuck and center against the hole to create the 1st threaded pocket. Then was assuming dial in the outer perimeter on the 4 jaw chuck for the eccentric pocket. But then what tooling would I use for the pocket. Not sure I could grind a 1/2" HSS blank to create a 3 sided boring tool. Was looking at T-Slot cutters and setup as a boring bar ! just use one tooth but dont think it would cut the bottom very well and tricky to find one with a correct size between tip and shank..

thanks

 

[michael-au]

Maybe you could use a T slot cutter and mount the stock on a rotary table

 

[ruzzie]

I offset it the .064" first and did the 1/4" hole then the thread & counterbore close to the .410" depth, then trued it up and finished the big cavity with a homemade grooving tool.

 

[RobConway]

Maybe you could use a T slot cutter and mount the stock on a rotary table

I did like that idea, but when looking for cutters tricky to find one with a 4.6mm cutting width.

Ended up finding this, the depth is very close to what I need and assume I can maybe pack the cutter or clamp it a little further out. Cutting depth required is 4.55mm and this has 4.4mm. Will have to grind the back off the cutter as the shaft dia is 16mm, but hopefully this will work.

 

[bluejets]

Think you'll find the original was a concentric hole with the esc. portion turned external and soldered in later.
2 I built some 5 years ago were at least.