Oh bugger

[bmp01]

1 hour ago, Conner said:

 

Job was done on a Bridgeport copy machine. I suppose it could have seen done on a lathe bolt a right angle plate to the carriage and set up the boring tool in a four jaw. As the casing was too large for a rotating face plate.

 

Yep thats the sort of thing. Adjustable boring bar directly into the head stock makes life a little easier. I'd need a bigger right angled plate (compared to the adjustable thing I have now) and then getting the bearing running true to the lathe centreline would be a PITA but it's doable.

[doobin]

Stuff like that is easily done on a small hobby type mill. I have a warco minor, pays £500 for it in mint condition, been in a jewellers all it’s life and never had anything other than a 2mm engraving bit!

[Conner]

Well finally got back onto building the saw up. Plenty of time for the loctite to cure. Saw starts up on high revs but won’t hold tick over. Hopefully just carb adjustment. The chain finally oils properly so a result there. An I right in my thinking if the saw was pulling air in it would rev higher.

[Stubby]

On 03/10/2021 at 20:07, bmp01 said:

Production machine shop verses Prototype machine shop..... it used to be the natural progression, the top machinists ended up in the prototype shop. 

Bridgeport milling machine would have been perfect for this. Mind you, at a pinch I'd give it a go on the lathe - horizontal milling.

I was in the dev shop ( prototype ) and would have done that on a Bridgeport Interact CNC using the circular pocket program instead on a boring bar .

[spudulike]

If the saw had an air leak, it would rev higher, sorting this will drop the revs to normal if the carb hadn't been adjusted.

If you can wind the L screw all the way in without the saw stalling, it has an air leak of some magnitude.

[Conner]

The carb wasn’t adjusted before the saw was stripped down and now won’t rev up fully. Thanks for confirming an air leak would cause it to rev higher. Il start adjusting the carb check throttle connections etc.

[Conner]

Thanks to all for the advice. Saw is running well. Found the reason for no tick over I had forgotten to put the throttle cable through the support. Doh. Going to run it on a 16” bar to run the bearings in already run on motomix so Lub should be ok.

[spudulike]

Good news, thanks for the update, always good after many putting forward possible solutions.

[Conner]

Still no explanation of how the wear occurred, was it initially from pulling the saw when it was jammed and subsequently from the outer rotating in the case?
 
A couple of hours in the machine shop would cost nigh on £200 hereabouts

After looking at the wear I suspect either the oil pump failed or no oil causing the chain to nip up or over tightness of the chain. The bearing faces looked evenly worn and although rough the bearing was still free. Prob a case of poor maintenance and set up[emoji31][emoji31]