Head Stock Spindles

[Skewpid]

Please see attached pics . .

The crappy chuck I have screws right up to the head stock on the MC because the thread is higher than the spindle (does that make sense?):rolleyes:

However, it simply stops short of the head stock and is not square on the Jet because the thread wont allow you to screw any further in.:mad:

So . . :rolleyes:

Do I need some sort of spacer for the jet?:confused: Is it a design fault?:eek: .. or, will I not have this issue when I purchase my new nova scroll chuck in the next few days?:) ..Although I can't imagine the nova will be much different . . thread wise.

Pls help:o

[baxter]

I think that the MC'sd usually have an M30 x 3,5 spindle while the Jet lathes are either 1" x 8 TPI or 1-1/4" x 8 TPI. You probably need an insert to use the old chuck on the Jet and check about the thread of the new Nova, I think some are compatible with the Jet lathes without an insert.

[Skewpid]

sorry .. both are 1" x 10 TPI . .

[clubbyr8]

Skewpid,

As Baxter says, the Jet mini has a 1" x 8 thread on the headstock spindle, so when you buy the G3 make sure it comes with the insert for that size thread.

I would buy the chuck with an insert so if you change lathes all you need to do is buy an new insert for the chuck to suit the new lathe. Lot cheaper than buying a new chuck.


Bob

[Wood Butcher]

I have seen packing pieces used between the chuck and the spindle. I recall someone ages ago mentioning using white chopping board to stop the chuck from binding on the collar on the spindle, but I think it would work in this situation as well!

[Skewpid]

I have seen packing pieces used between the chuck and the spindle. I recall someone ages ago mentioning using white chopping board to stop the chuck from binding on the collar on the spindle, but I think it would work in this situation as well!

Its binding on the thread, not the collar, simply because there is no more thread to bite into with the Jet . .(sorry, trying v hard to explain here)

Its different on the MC due to the thread being proud of the spindle, the chuck just screws pas the end of the thread and flush to the head stock thingy .. so its all square.

[Wood Butcher]

Its binding on the thread, not the collar, simply because there is no more thread to bite into with the Jet . .(sorry, trying v hard to explain here)

Its different on the MC due to the thread being proud of the spindle, the chuck just screws pas the end of the thread and flush to the head stock thingy .. so its all square.

I'm sure I know exactly what you mean. The case I mentioned was an example of it being used, but I think that in your case you have three options
1. Put a packing piece in to make sure that the chuck doesn't get to the end of the thread
2. Have a fitter machine the adapter in the chuck to allow clearance for the non-threaded section on the spindle
3. Remove the spindle from the lathe and have someone machine a relief after the thread.

2&3 are going to cost you heaps. For no.1 all you need is something cheap and solid to place on the thread. I'd go no.1

[Wizened of Oz]

sorry .. both are 1" x 10 TPI . .

Yes. The manual for the Jet Mini says the spindle thread is 1"-8 but it is actually 1"-10.
The Nova inserts have a clearance to span that last 4-5mm of unthreaded spindle and they screw right up to the shoulder. So it seems your chuck or it's insert, if it has one, is poorly made.

[Skewpid]

Gotcha Rowan .. but hoping I wasnt gonna have to add a "bit" to the lathe .. should be right just the way it is.

However ... those who have the nova and vic chucks ... question for you.

Does the thread on the chucks extend all the way to the base of the chuck? .. or does it stop shy?:confused:

Ive just looked at the faceplate that came with the jet and the thread stops shy of the end, allowing it to screw that little bit extra to the head stock.

[Skewpid]

Yes. The manual for the Jet Mini says the spindle thread is 1"-8 but it is actually 1"-10.
The Nova inserts have a clearance to span that last 4-5mm of unthreaded spindle and they screw right up to the shoulder. So it seems your chuck or it's insert, if it has one, is poorly made.

Ahuh!

Thanks Brian .. that is the answer I was looking for.:)

So it is the chuck thats crap (it is a cheapy:o ) and now very happy Im gonna be choosing the better one.

Having said that, now comes another dilema that I hope you all can help with.

I have a MC 1100 and the Jet mini .. will the G3 be ok on the MC? .. even with larger stuff? .. Or, will a supanova be ok on the Jet? . ..(thought it may be a bit too heavy) .. anyone had experience with this?

Thanks again all:)

[Wizened of Oz]

Ahuh!

I have a MC 1100 and the Jet mini .. will the G3 be ok on the MC? .. even with larger stuff? .. Or, will a supanova be ok on the Jet? . ..(thought it may be a bit too heavy) .. anyone had experience with this?

The SuperNova would not be recommended for the Jet Mini. Teknatool say the G3 can handle up to a 14" bowl.

www.teknatool.com/products/Chucks/G3/Nova_G3_Chuck.htm

[Skewpid]

Thanks Brian

[Gil Jones]

Over here the Jet mini spindle is 1" x 8 tpi, as is my General Intl. Maxi-Lathe. My spindle threads stop about 3mm shy of the base, and there is a clearance cut as deep as the threads in that 3mm.
My Compac Nova Chuck, VicMarc 100, and Chinese knockoff of the VicMarc 100 all have a 5mm clearance cut machined before the start of the chuck threads.
I suppose you could take 3mm to 5mm off the beginning of your chuck threads, and solve the problem, or cut the clearance on the spindle (or both). Or use a spacer on the spindle, as long as it is machined flat (a punched out washer will not be flat).
Good luck!!:)

[rsser]

Yeah, I found the Titan chuck wouldn't screw right down to the spindle shoulder on the Vicmarc 175 and a forum member kindly volunteered his son to turn up a steel spacer. I'd tried white plakky chopping board, large washers etc without any luck. Some guys have had success with cutting a spacer from thick leather.

[Poloris]

I had similar a similar problem,my spindle screwed clean through a thin faceplate and pushed against my workpiece. This had the potential to push the job off the faceplate whilst turning.

My solution was to turn a 19mm long spacer from 1" ID steel waterpipe.(On a metal working lathe.)
The spacer now rests between the inside of the spindle bearing and the faceplate.

[rodent]

I use a washer ive made from one of those nylon cutting boards it works fine