Woodturning.

kadman

Anyone here using bowl coring methods to save timber.

And if so, what type are you using. Considering it myself, but seems to be an expensive initial set up.

Comments welcome

kadman

woodturner

The initial cost is very expensive. I have the base from the Oneway coring system but have yet to get the knives for it. Should be getting one soon. If you like you can use mine when I get it.

kadman

woodturner wrote: »

The initial cost is very expensive. I have the base from the Oneway coring system but have yet to get the knives for it. Should be getting one soon. If you like you can use mine when I get it.

Thanks very much for the offer woodturner.

But I,d draw the line at borrowing other folks expensive bits of kit.
I dont think its fair for a lot of reasons, could lead to many problems
between friends. Thats why I,d be more inclined to have my own kit.

I,ve looked at the oneway on the net, and it seems to be a good setup.
Where did you source yours.

I need a source too for a new scroll chuck. Interested to know what you are using out there.

I have a record RP 2000 I think from way back. But it wont fit my centauro.

kadman

woodturner

What thread is your spindle?

kadman

woodturner wrote: »

What thread is your spindle?

Not too sure, and no word from the manufacturer.
Kadman

woodturner

Let me know what model it is and I'll ask at the Chapter.

kadman

Its a Centauro TM 2000, this model here. It includes the outboard extension, that allows for
42"+ turning.

http://www.fordaqmachinery.com/wood/products/ViewProduct/Centauro_TM_2000__532.jspa

Calahonda52

kadman wrote: »

...
But I,d draw the line at borrowing other folks expensive bits of kit.
I dont think its fair for a lot of reasons, could lead to many problems
between friends. Thats why I,d be more inclined to have my own kit.
...kadman

well said, its a pity its not more widely and clearly understood by the "asking" folk....

kadman

Calahonda52 wrote: »

well said, its a pity its not more widely and clearly understood by the "asking" folk....

I have a wide circle of woodworking friends, and i think its because i would never take advantage of them by asking for their hard earned tools.

Of course some of those enemies I have , that I thought were my friends, never , ever, ever ,ever,ever, returned my tools, books,,,,,,,

But yeah, your tools are a personal item, and deserved to be looked after by you


kadman

woodturner

If you have a faceplate you might be able to determine the thread from it.

woodturner

I tried to post a link to the Versachuck from The Toolpost in the UK. It comes with standard and off standard backplates and blank backplates that can be tapped to suit your lathe.

rossit

hi guy just wondering if ye guy know of any place in the southeast that sell woodturning tools.i`m looking for a faceplate but not sure how to get the right one .any advice would be appricated

delaney001

rossit wrote: »

hi guy just wondering if ye guy know of any place in the southeast that sell woodturning tools.i`m looking for a faceplate but not sure how to get the right one .any advice would be appricated

Ronaynes in thurles have a very good store. Carpentry store in naas have a huge amount of turning equipment. Not sure of any others.
Done deal, adverts and turning-group-emails are a great job tho

kadman

I was hoping to buy a chuck that was a straight fit onto the existing.

Bought a pitch guage, so should be able to measure it now:)

rossit

thanks guys i measured the thread with a compass but when i got the face plate it was to small. the lathe is a old training center one no name on it just newman on the motor.im just busting to get going but ill no go without a faceplate. great thread im sure ye will be seeing me around

Alun

Many of the lathes used in schools and other educational institutions in the 60's and 70's were English manufactured (Newman was an English motor manufacturer based in Yate near Bristol) such as the Harrison Union Graduate or Jubilee models. There's a great resource here http://www.lathes.co.uk/ all about lathes, and other machine tools, from that era, including Harrison http://www.lathes.co.uk/harrison/

There probably isn't anything the owner of the site doesn't know about old lathes, so maybe email him a photo and see what he says.

Alun

Many of the lathes used in schools and other educational institutions in the 60's and 70's were English manufactured (Newman was an English motor manufacturer based in Yate near Bristol) such as the Harrison Union Graduate or Jubilee models. There's a great resource here http://www.lathes.co.uk/ all about lathes, and other machine tools, from that era, including Harrison http://www.lathes.co.uk/harrison/

There probably isn't anything the owner of the site doesn't know about old lathes, so maybe email him a photo and see what he says.

recipio

rossit wrote: »

thanks guys i measured the thread with a compass but when i got the face plate it was to small. the lathe is a old training center one no name on it just newman on the motor.im just busting to get going but ill no go without a faceplate. great thread im sure ye will be seeing me around

You need to find the name of the lathe and then google for the thread size. Most of the info about old lathes in now online and chances are you will be able to order a faceplate online.

rossit

hope this shed some lightlathe.jpeg

rossit

sorry its so small took me a while to figure out how to add a attachment

rossit

got sorted guys thank let the fun begin

timfromtang

kadman wrote: »

Not too sure, and no word from the manufacturer.
Kadman

what thread is your spindle,, a lad might take that the wronng way if asked LOL,, seriously though tis either metric or imperial, and will have a thread pitch, threads per inch or metric (whatever them new fangled folk use threads per kilothingy i expect but anyway).

a steel rule, and hold it against the threads parallel with the axis of the spindle, do they line up nicely in some round number or half number 7 1/2 tpi for example with inches? or indeed with mm? or cm on the metric side of the rule??
next the diameter ,, is it a nice round number ,, in metric or imperial (careful here if measuring in thou look up your tables for thou equivalents of common fractions of an inch)
Threads on lathe spindles come in a few common sizes.

in short

what thread is your spindle
measure it!

imho every turner should have a little machinists Zeus book either tucked in a top pocket or popped in a dry drawer somewhere, seriously handy tables in there, a great little ready reference...


tim

kadman

Just managed to check it today, after a long break from an injury.

Thread is an M40 and with a pitch measurement of 4, using a German
Metrish pitch guage. Fairly large thread.

Measuring the thread grooves over an inch, 6 no. Peaks counting
the starting point, 7 no.

Alun

Is it exactly 40mm outside diameter? That's pretty close to 1.5" and 1.5" 6tpi BSW is a thread commonly found on some older English lathes like Union and Wadkin.

EDIT: just looked at your original post and see it's an Italian make, so unlikely to be an imperial thread. Can't see anything in M40 regardless of thread pitch in any of the well known chuck manufacturer's brochures.

woodturner

Peter Hemsley at the Toolpost said he could machine a backplate for m40 if that's the correct size. He said the backplates are very substantial and can be machined for that size thread

kadman

woodturner wrote: »

Peter Hemsley at the Toolpost said he could machine a backplate for m40 if that's the correct size. He said the backplates are very substantial and can be machined for that size thread

I know i could get a backplate machined. But I was hoping to buy
a chuck off the shelf. As i already have 2 or 3 different lathe attachments
that came with the machine.

Yep its looking like the only option.

delaney001

https://my-tools.ie/products/vicmarc-vm100-chuck-kit-m40-standard-jaws-insert-required

Is this not what you need?

Alun

delaney001 wrote: »

https://my-tools.ie/products/vicmarc-vm100-chuck-kit-m40-standard-jaws-insert-required

Is this not what you need?

M40 refers to the model number of the jaws there I think.

Here ...

http://www.vicmarc.com/default.asp?contentID=686

is a list of all their inserts, maximum metric size is M33.

One interesting thing though is that they also show a "BLANK" insert in the list so presumably you could get one of these and get a friendly machinist to put any suitable thread you wanted on it.

kadman

delaney001 wrote: »

https://my-tools.ie/products/vicmarc-vm100-chuck-kit-m40-standard-jaws-insert-required

Is this not what you need?

No.
M40 here refers to the jaw size.

woodturner

kadman wrote:

No. M40 here refers to the jaw size.

Peter said the Oneway Stronghold chuck comes with that thread so there is no messing about with having to machine anything. Give him a call and he'll look after you. Got a bit of stuff from him over the years.

kadman

woodturner wrote: »

Peter said the Oneway Stronghold chuck comes with that thread so there is no messing about with having to machine anything. Give him a call and he'll look after you. Got a bit of stuff from him over the years.

Nice one, who's Peter?:)

Thanks

woodturner

kadman wrote:

Nice one, who's Peter?

The owner of The Toolpost in the UK.

kadman

woodturner wrote: »

The owner of The Toolpost in the UK.

Site wont open for me??

delaney001

kadman wrote: »

Site wont open for me??

http://www.toolpost.co.uk

kadman

The shaft details of this machine are a better kept secret than the Vatican files.

Centauro Italy have been contacted, but no word yet. Looks like a trip to the nearest
engineering outfit, for their input.

kadman

Finally established that the shaft thread and type on my lathe is,

M39 x 4 pitch measurement.

So at least I know what I,m looking for. I thought M39x4 was an oddity,
but apparently not.

kadman

To date, I have been unable to source a chuck to suit my lathe.

Either with a chuck insert, or even a suitable blank, that can be
re machined to suit my needs.

Problem occurs when the lathe threads are above 33mm. Mine
is an M39. So the shaft size creeps well above the direct fit
into the M33 of the larger chucks.
This necessitates a larger billet being needed where the two machinings
and sizes come into close proximity to each other.

Still waiting on e mails from 2 large suppliers. But I,ve also got e mails
from 2 others who say they are not in a position to help.

Looks like my own cad design, and a trip to the local works, plus loads
of denaries. Pushing up the expense slowly

kadman

I suspect its something like this I need.

But my german is scheissen

http://www.drechselstube.de/spanntechnik/adapter/4008.html

woodturner

No you don't want a chuck adaptor. These bring the chuck further out from the headstock and can increase wear on the lathe bearings. If you look up the Oneway Stronghold chuck you'll see how it's machined. Peter Hemsley said it was possible to thread the backplate for M40 so I can't see why threading it M39 should be any harder

woodturner

These go directly into the chuck and only the flat flange protrudes from the back of the body of the chuck.

woodturner

Hope this helps.

kadman

I checked Toolpost before, but my thread type was not listed.

So I didn,t follow up there. I,ve sent on all the spec now.

Fingers crossed

woodturner

Hope you get sorted. On the Oneway site they have a backplate threaded for M40x6 so they should be able to look after you.

kadman

woodturner wrote: »

Hope you get sorted. On the Oneway site they have a backplate threaded for M40x6 so they should be able to look after you.

But is back plate set up suitable on the one way chuck.

Or is the one way chuck threaded fora shaft setup?

woodturner

Each backplate they make is threaded for a specific lathe. The chuck comes without the backplate (has no threads at all) You order the chuck and the backplate suitable for your lathe. You'll see on their list they don't have the one you need but they do custom make them for customers.

kadman

So you are saying the chuck is a backplate mount arrangement, and not a direct thread
onto my lathe shaft??

woodturner

None of the chucks come directly threaded, they are supplied with whatever backplate suits your lathe.

kadman

woodturner wrote: »

None of the chucks come directly threaded, they are supplied with whatever backplate suits your lathe.

So what is the backplate mounting diameter on the back of the chuck??

Maybe I can use existing backplates from my own 3 jaw chucks, if the diameter suits.

Still no joy from any chuck manufacturer, and toolposts e mails are problematic.

kadman

Got it.

So the threaded insert for the oneway and strong hold chucks
work like this.

Female end of insert fits onto my lathe shaft.

And the unthreaded male end of the shaft is an interference fit
into the new check.

Held on to the new chuck with 2 bolts, in line with the axis of
my lathe shaft, bolted into the rear face of the new chuck.

Clear now.

So the chuck and bowl blank rely on the strength of a 6mm or 8mm
blts to with stand the torsional forces applied to them by the out of
balance bowl blank, and shaft speed. Okayyyyy.

Gotcha.

So all i want is an M39x4 insert and 1 Talon chuck.

But computer says no on the insert, and no word on the blank yet.

kadman

Just sent Toolpost another email.

woodturner

They'll machine an insert to suit your lathe, probably an extra cost. The stronghold chuck is larger than the talon chuck. It'll recommend what chuck will suit your lathe. If your lathe has a large swing the larger chuck would probably be better.