God mode restorations
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Evening guys.
Has anyone of you chaps made cross slide lead screws with acme threads.
Has anyone of you chaps made cross slide lead screws with acme threads.
I remember seeing the tool you made for that twin start thread. Was impressive stuff.Yep, it's not difficult. I made one with a 2-start thread came out nice.
The operating leaver and clutch all works. Just the missing star wheel / cog.Looking at the pic on the lathes website it seems like it had a star wheel which most likely had a spring-loaded sliding gear on the shaft. Looks like all that's broken is the thread for the star wheel. Drill and tap the cross-slide for a new thread.
EDIT: actually I bet it was a star wheel and friction clutch.
View attachment 123884
Yes. The leaver just engages the sliding feed.Best I can tell the operating lever only works the sliding feed. Surfacing feed looks like it's engaged by tightening the star wheel. Lots of lathes have this but it's usually on the front of the apron.
Yes I see what mean nowLooking at the pic on the lathes website it seems like it had a star wheel which most likely had a spring-loaded sliding gear on the shaft. Looks like all that's broken is the thread for the star wheel. Drill and tap the cross-slide for a new thread.
EDIT: actually I bet it was a star wheel and friction clutch.
View attachment 123884
Just found this picture Pete. Think your right.Best I can tell the operating lever only works the sliding feed. Surfacing feed looks like it's engaged by tightening the star wheel. Lots of lathes have this but it's usually on the front of the apron.
Yes. Got to get reading and suss it out so I understand it.You should be able to work out the size of the missing gear, first by working out the DP (pitch) of the existing gear then you can calculate the number of teeth require, from the existing gear and the spaceing of the shafts.
Got ya Pete. Awesome. Thanks for the information mate. Appreciated. Will do that tomorrow.Work out the DP of your big drive gear (tooth count + 2 / diameter in inches). Get a piece of card and drill a hole in it so that it fits on the shaft and mark the card at the bottom of one of the teeth in the big gear. Now turn the card 180 and mark again. the two marks will be the diameter of the gear apart (ignoring clearances). From that you do (diameter x DP) minus 2 to get your tooth count for the small gear. Now you know the DP and the tooth count all you do is find a gear and bush the middle with bronze or cast iron to fit the shaft.
Am I missing something, why not just measure the distance from centre of shaft to bottom of tooth then double?Just had a thought you could take a pen and stick it in the bottom of a tooth on the big gear then spin the card to draw a circle