Changewheels anyone ?.

I am having trouble deciphering what the manual means by headstock, and stud. I can get 'Int' . Below is the change wheel arrangement in my lathe and what DSG recommend for threading. Can Anyone put names to the wheels or tell me how to work it out. Headstock seems clear expect they are all way below the headstock and working out which could be headstock related seems impossible. Manual not much help.Eg is a stud gear one that revolves with no through connection to the box ?.

looks like something is missing what lathe is it

Hi capnhab,
I've never seen a DSG lathe so this is how I would go about finding out. I would guess that the "int" (intermediate ) gear is the one that just rotates on a stud with no drive to or from it. I would say that it is the right hand gear on your picture.I suspect the top gear is the headstock one. You cab confirm this by removing the intermediate gear and turning the chuck. The gear that rotates will be the headstock one. I suspect the gear at the bottom is driving the input shafr to the screwcutting gearbox. If you turn this gear you should see the leadscrew rotate.

Les.

It looks as though you've rotated the image by 90 degrees anti-clockwise. That's just not fair

"Head" is the gear that runs on the chuck shaft.
"Inter" is probably a lower position.
"Top Stud" is probably a higher position

There will also be a fourth gear on the shaft that is connected to the leadscrew.

It says there should be a 60 tooth gear first and two 75 tooth gears. That doesn't seem to be what you have.

Some wider shots (the right way up) would help.

Sorry Gents , its a Dean smith and Grace 17T. The photo was rotated in transit...I will try some more photos and video. Rotating the chuck with the drive engaged doesn't do anything in the change wheel department. I can rotate the feedshaft as in the video if it works.

sorry bout the noise from the compressor 2 inches away.

Heres a better photo.

Ah, much better, thanks.

So the bottom right shaft is the feed shaft and the upper shaft is the leadscrew. only one of these may be in use at any given time.

My guess is that the top gear there moves from where it is for screwcutting to the other shaft for feed only.

That leaves the lower gear being an idler. It appears to be a on stub shaft set into a swing plate or "banjo" plate. It can therefore be adjusted to engage when the last gear is on the leadscrew shaft or the feed shaft.

Does that help?

Very helpful capstan, getting there.. I am without power at the moment but I am sure I will now be able to fathom it out when I have. Thank you.

I suspect you have a gear on the top stud and nothing on the bottom stud. You might find that the bottom stud is effectively a direct drive to the leadscrew for cutting odd pitch threads if the change wheels are available.

I have done a lot of turning on a DSG but didn't need to mess with change wheels, only gearbox settings so didn't even look at what was behind the cover. One interesting aspect was cutting a thread that on most lathes would mean that the screw cutting indicator wouldn't be of any use. It was on the DSG.

John

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Yes John, you're right , once setup I don't think they need to be changed very often. I need to check though.

Hi, I have recently bought a DSG 17 x 36 which appears to be from the same era as your machine i.e. motor sticking out the end rather than behind the machine.

Here's a couple of pictures of the (standard for the indicated threads in the glass panel) changewheel setup on my machine.

AFAIK, the bottom gear is the one which feeds the threading box; on my machine the feeds are a fraction of the selected thread, I have only run a 17T once, but seem to remember it being the same.

Cheers stueeee, am coming round to agreeing with you. I think I have an extra leadscrew connected arbor. Thanks for putting the pics up.