What taper does this mill use

Hello everyone,

I have a 0V mill with 6 original collets and would like to fit an Clarkson Auto lock. As far as I know my mill does not have the Herbert Easy Taper. I purchased a Clarkson Easy taper auto lock some time ago but it does not fit. The machine is very well made and in excellent condition so I do not want to get rid of it.

Hope that someone can offer some information.

Have you searched the forum? There is a thread on this mill and its taper.

Stan

I was told by the machine supplier of my Herbert 0V the taper was an R0

Emgee

Just had a look in my Herbert 0V operators manual, no help. I made a new spindle with a 4MT taper to suit some existing tooling I had. With hindsight I may have gone for a small international taper. Would the OP consider this approach? Not 4MT but 5C or R8?

I have collet chucks for the machine but prefer to use collets that fit directly in to the spindle nose, far more rigid then a chuck protruding from the spindle nose. Also more Z axis capacity.

My 4MT collets are ex-Meriden Triumph tool room.

The 0V is a nice machine, very rigid and accurate, I'm surprised more haven't found their way in to home workshops.

NDIY, can't find the thread you mention, got a link?

John.

Old British machines, including Herberts, used a taper that was known as NS(for Non Stick) 1 3/8". Unless yours has already had a remade or modified spindle.

Brian

Hello everyone,

Many thanks for all of your input, much appreciated.

The Clarkson auto lock which I purchased ages ago was NOT an "easy taper" but a NON STICK 1 3/8" as indicated by Brian H.

I will explore the R0 dimensions and compare the dimensions to the collet dimensions which I have with the mill.

Will keep you all posted as soon as I have made progress.

Hello Stan,

I also have an 0V and it also came with the 6 collets in a wooden block. I could not find any other collets or informatio on the taper type and came to the conclusion that they must be particular to the machine.

John Stevenson modified my spindle so it now takes R8 collets which are plentiful. It involved pressing a slug of steel into a recess that he cut into the end and machining the R8 taper into it. I'm very happy with the result and have been using it for quite a few years

I considered adapting another chuck like an autolock to it but decided agaist it to give as much z-height as possible and also keep things as rigid as I could. I think it was a good choice and woud suggest you consider the same.

Does your machine have one Tee slot in the bed or three?

Regards

Pete.

NDIY, can't find the thread you mention, got a link?

No link. I’m sure it was a thread that involved Pete, John and R8 conversion.

https://www.model-engineer.co.uk/forums/postings.asp?th=167987

Not sure how to inplant a link properly, used to but old age has struck, lol

Above is one thread, there were others, started by Steve aka "me", he bought a Herbert back of last year.

Do a serch on "Herbert" will turn up other information.

Pete

aaaaarrrr the link fancy style

Not as old as I thought 

I am sure that there was another thread, started my "me" steve that is, search his posts and mine may well help you out. 

I machined a "thin ?" sleeve, outer  outer NS 1 -3/8 inner Int 30, works for me and easy to machine. The tapers are the same 

Edited By Pete White on 07/10/2021 10:28:38

Edited By Pete White on 07/10/2021 10:30:05

Mine was done in 2009 by John. I did have the details on email but they have long gone. I think he used EN40 for the end slug, he machined a parallel pocket in my spindle end, pressed in the slug then machined it to size for the R8 collet. When I fitted it up there was a tiny bit of runout so I tilted the head over to the R8 taper angle, put a lathe tool in the mill chuck and took a skim cut to make the taper run dead true.

https://bbs.homeshopmachinist.net/forum/general/35047-herbert-mill-spindle-r8-conversion

Worth noting that the Herbert spindle through-hole does not quite have the clearance for the R8 drawbar but it's only a few thou so he made a slightly undersized one for me and it's been in use for 12 yrs now. I have to say I can thoroughly recommend it as a modification it opens up a wide range of usefulness being able to use the R8 tooling.

Edited By Pete Rimmer on 07/10/2021 19:04:50

You have at least one arbor that fits, so ,measure that and then take a look at "Tools-n-Gizmos"

That lists a large range of tapers,mand their dimensions, so you may find what you seek on there.

Howard

Hello Members,

Great news. After all these years ( at least 30 ) since I purchased the mill, I managed to contact the seller. He found the missing auto lock which was stowed away in his loft. Although he did previously say that it had been sold but the purchaser never turned up. He sent it to me with some C type collets f.o.c. What a relief..... Better that winning the postcode lottery.

I have attached a couple of pictures.

Thank you all for your input, very much appreciated.

Good result Stan