Originally Posted by
Cat 1
Thanks Jesse,
Yes I can cut single point threads and would only need the tap to create a go/no go gauge to get the outer threads right... I have a trick VFD drive on my old lathe and it makes treading a much easier task as i have the ability to drive very slowly and stop instantly.
Here is how I would proceed - rough finish the insert and "short tap" it. Then using the tap as as a guide the setup can be made of the carriage to thread the OD . Because of the "flange" the setup would be a bit tricky and would have to be cut "upside down" and "backwards".
This type of repair is better done with all parts on hand to get the fits correct - if you can find a "local" with the right equipment it might be easier - I am willing to give it a try though Lonnie but it might take me a while as I have a pile of work stacked up here..
I understand why you would need the tap. Yessir, we are on the same page.
Especially the "backwards" part, perhaps doing the 1/4" female thread from top side, flip part in collet and cut the 5/16" up to the shoulder then part off.
With you as well regarding the variable freq drive; Lathe here as well as Bridgeport got the conversions long ago. Really sweetens up operation.Forward/braked stop/reverse, half nuts engaged , very helpful. Almost like having a Monarch 10EE!
Yes, you would certainly want everything on hand before starting. Several possible techniques .
Too bad the previous owner didn't simply use Time-Serts, perhaps unaware they existed. The lack of indexing or "nesting" of the threads probably led to the failure. Not a lot of wall thickness to spare.
Anyhow, tap is here, USA made. Yours if you can use it.