Headstock Spindle Thread

[tony]

I have a Nova DVR 3000 which was purchased new in 2003. I bought this second hand from a club member, who has sadly passed away. There is some minor thread damage & I wondered what the best course of action would be. I may be wrong , but I think it's M33 x 3.5 RH. Thanks in advance. Cheers Tony.

 

[NickDReed]

Hi Tony,

Looks like you would be able to replace the part if it has come to that.

https://www.carbatec.com.au/documen...nODPYYAi3NBi2dU6Cy0Kj_FkqnDXhz4JctUeQOiYJ8EZs

55003 Headstock Spindle 1 1/4" 8 UNS RH
55103 Headstock Spindle M33x3.5 RH

It appears the lathe has been discontinued, but https://www.teknatool.com/contact-us/ might be a good place to start to see if you can get parts in the UK.

 

[ChaiLatte]

The manual gives you three choices of thread size:

https://www.carbatec.com.au/documents/manuals/Nova/nova-dvr-3000-manual_mar-2005.pdf

If you are unable to discern the thread pitch using a ruler or calipers (measuring over as many threads as possible), you can buy a thread pitch gauge for £6.29 (https://www.amazon.co.uk/Stainless-Thread-Imperial-Cutting-Measuring/dp/B08MT6KYVW) which will assist in that determination.

Posting a photo of the spindle would help us to give specific advice on solutions to your problem.

If the damage is minor and the thread is metric, a small triangular file can dress the threads better. At larger expense, a thread restorer file is better, but I am unable to locate one which offers 3.5mm pitch.

 

[Duncan A]

If, as you say, the damage is minor, I'd just try dressing the threads with a small triangular or thin file, or even with a set of needle files.
Possibly even a suitably shaped diamond sharpening tool which you could then use for little tool sharpening jobs around the workshop.

 

[SVB]

You can buy m33 x 3.5 dies for not much (or if you’re near Glos you can borrow mine!).

 

[Paul Hannaby]

Aren't those lathes 1 1/4" x 8tpi? That may explain the thread damage!

 

[Inspector]

Aren't those lathes 1 1/4" x 8tpi? That may explain the thread damage!

The ones sold here in North America were. Both my Nova 3000s are. Can't say what would have been sold around you.

Pete

 

[Phil Pascoe]

Two different backplates listed -
https://www.beaufortink.co.uk/toolp...readed-backplates-for-versachuck-lathe-chucks

 

[tony]

Aren't those lathes 1 1/4" x 8tpi? That may explain the thread damage!

I've just had a look at the lathe & you are correct , it is 1 1/4 × 8tpi. I don't know if the insert is the correct size as it came with the chuck. There doesn't appear to be any damage to the internal threads on the insert , but there is some damage to the spindle threads on the lathe.

 

[tony]

If, as you say, the damage is minor, I'd just try dressing the threads with a small triangular or thin file, or even with a set of needle files.
Possibly even a suitably shaped diamond sharpening tool which you could then use for little tool sharpening jobs around the workshop.

I did try filing it with a small triangular file, but it hasn't solved the problem.

 

[tony]

There is what looks like an L imprinted on the insert. Does this suggest that it's L/H or something else.