Threading from left to right?

Here yall go, the threads are 5/16"-24 UNF.

Let me know if it is big enough to see what yall need to, I had problems with the size to upload to the forum.

Tip Adaptor.JPG
 
John, is this just a shaft extension? On a motor or some such?
It may not be critical, but if you hand tap that to screw onto an existing threaded shaft, you will probably see considerable run out.
Just something to consider

Cheers Phil
 
12bolts said:
John, is this just a shaft extension? On a motor or some such?
It may not be critical, but if you hand tap that to screw onto an existing threaded shaft, you will probably see considerable run out.
Just something to consider

Cheers Phil
Click to expand...

It is more of a shaft adaptor, but I can not see the runout being enough to make a difference, not going to be spinning. Do you know about how much could it be off?

Just for curiosity, how else could you thread an internal 5/16" hole?
 
I will most likely do it as Gordon said. My tap and die set that I have says to use a letter I drill bit, so that is the size range that Gordon said, which 17/64" is also. I don't have letter bits right now, but when I buy my lathe and tools I am going to buy a 115 pc drill bit set.
 
jonathan01 said:
It is more of a shaft adaptor...
Click to expand...

Is it possible to leave this oversize on the external diameter.
Follow your plans for creating the stepped hole, drill and tap the threaded section that you need, fit it to the shaft you need to "adapt", and then true up the old shaft on your lathe. Ignore the runout, if any, of your new part.
Now turn the OD and you will end up with a perfectly true adapter. If you want the adapter to be removable and reinstall to be true again then you need a nice clean square shoulder for the part to pull up against. If its a "set and forget" then loctite, or pin it if necessary.

jonathan01 said:
Just for curiosity, how else could you thread an internal 5/16" hole?
Click to expand...

Drill and tap works best for me on stuff this size. But I would be going along the above course to keep it true.

Cheers Phil
 
Thanks Phil, I am planing on starting out with a 1/2" OD, and end up with the 7/16" OD, would this should be enough oversize to correct any runout if any?
 
12bolts said:
Is it possible to leave this oversize on the external diameter.
Follow your plans for creating the stepped hole, drill and tap the threaded section that you need, fit it to the shaft you need to "adapt", and then true up the old shaft on your lathe. Ignore the runout, if any, of your new part.
Now turn the OD and you will end up with a perfectly true adapter. If you want the adapter to be removable and reinstall to be true again then you need a nice clean square shoulder for the part to pull up against. If its a "set and forget" then loctite, or pin it if necessary.



Drill and tap works best for me on stuff this size. But I would be going along the above course to keep it true.

Cheers Phil
Click to expand...


This is how i went about making a shaft joined by threads and you can't really see the joint even if you know where it is. Works great if you have the diameter to work with.
 
John,
If you can chuck up your blank adaptor as central as possible, use the 4 jaw if needed, and drill and tap it in the lathe, use the tailstock to keep your tap true, then you might be right. You are drilling a pretty deep hole for that diameter. Bill's suggestion for drilling undersize and boring to final diameter will help lots. If you can get all the internal work done on the lathe without removing it from the chuck then you probably stand a pretty good chance of minimal run out when installed on the shaft. 1/16" is not a lot to play with. Remember thats only 1/32" each side:whistle:
If you need any clarification of any of this just post away.

Cheers Phil
 
12bolts said:
1/16" is not a lot to play with. Remember thats only 1/32" each side:whistle:...

Cheers Phil
Click to expand...

I think I mean 1/8" than, the tip of the skinny end (5/16") can be 1/16" out of line with the butt of the fat end (7/16"), maybe a hair more.
 
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