The Shop > Tools
Chuck backplate with 1" 8tpi thread?
petertheterrible:
What Baron said about using a barbell weight is great advice. Get one that is similar in size to your chuck. All thread on type chucks will have some sort of register that keeps things aligned.
When cutting cast iron on small machines like the ml7, I first use a burr to remove the skin, a lot less hassle than chipping a carbide insert. Externally I use a grinder and remove the scale by hand away from the lathe, less mess better machining.
petertheterrible:
This one is made from a castor used on trolleys to hang beef carcasses on. Bought about 100 of these trolleys and have found many uses for these wheels,and trolleys/cages themselves. Threads are single pointed for a myford ml7. Just one way of doing it.
Meldonmech:
Edward is your lathe capable of screw cutting? If so doubleboost has made a very good video of how to cut internal and external threads on the lathe. I believe they were 8tpi. I have made several screwed back plates for various lathes in the past, and if you havn't screw cut on a lathe before you could practice on scrap.
Good luck
Cheers David
edward:
Loads of great advice, thank you all so much.
I have several options to consider. 'Best' of these is probably to keep a look out for some suitable material and make one. There appear to be commercially available blanks so might even give one of those a whirl if I cant find a barbel or trolley wheel! Thread wise I should really learn to screwcut but it has always terrified me a bit, even watching Johns videos where he does take away some of the fear....
I have ordered a tap as well, just because I can really!
Before any of this happens I need to get the headstock aligned with the bed properly. That isnt going to be much fun but needs must!
petertheterrible:
Best advice I could give for a first time threader is to do it by hand. Forget the back gear, remove the drive belt from the motor, if you have a crank, use it otherwise set up the thread pitch you want and use the large reduction pulley to turn. Pretty easy cutting threads even if you don't have adequate kit.
Beginners tend to be overwhelmed by theory, it's good to know theory, but it's better to have a working lathe. Theory is usually not understandable without seeing it practiced first.
Do it by hand, KISS, know your thread angle and pitch, and keep a sharpie handy to mark the increments that you cut with each pass and most importantly, for me at least know the max thread depth and OD or ID.
No motor, no :poke: :bang: :doh:, preferably wife driven instead.
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