By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

1.5 Morse Taper Short Form

All Topics | Latest Posts

Search for:  in Thread Title in  
John Macaulay18/07/2010 19:58:36
4 forum posts
Does anyone have the specification for a 1.5 MT short form.   This is the headstock taper in my TOYO ML1 lathe.   I have had a few queries from around the world for copies of the manual which I have given freely to model engineers refurbishing the TOYO.  However I have not been able to advise as to where they can get the headstock taper from.   All current mini lathes seem to have 1 MT or 2 MT in the headstock
Stub Mandrel18/07/2010 22:25:46
avatar
4318 forum posts
291 photos
1 articles
Hi John,
 
I can only confirm you are not insane - I have read of in-between morse tapers so you are not hallucinating!
 
Machinery's handbook is sielent on half-step tapers, but does make it clear that 'stub tapers' are the large end of the normal taper.
 
The taper per foot of MT1 is 0.59858" and MT2 is 0.59941, and increases a little for each larger size. I would guess, therefore, that MT1.5  should be very close to 0.5990" per foot.
 
I do wonder, though, if MT1.5 stub form is actually the small end of a normal MT2 taper? Have you tried to see what happens when you push and MT2 into the headstock?
 
I hope this helps a little.
Dinosaur Engineer18/07/2010 23:42:34
147 forum posts
4 photos
I think that MT1.5 is what the americans call a "stub taper"  This is a shortened version of a standard MT1 taper .The stub taper details are as follows ( Std.MT1 in brackets) ;-
Taper per foot 0.59858 (0.59858) , small end dia of plug 0.369" (0.4314) , shank length incl  tang shank  1_5 /16" (2_9/16") ,  The stub taper MT1 ( or MT1.5 as we call it) has a plug depth of 7/8" so any reduced length MT1 standard taper without tang will fit , provided it does not penetrate the socket hole by more than say 13/16"  . This is asuming that there is a step at the end of the socket taper. It may be that a standard MT shank will fit provided that there's no step at the end of the socket taper.
Dinosaur Engineer19/07/2010 00:11:31
147 forum posts
4 photos
It may be as Stub mandrel says that the MT1.5 is the a shortened version of the standard MT2 taper. It may be that the American stub shank is not the same length as our "1/2" sizes. But the American sizes are as follows for ref purposes. 
The coresponding MT2 American stub taper shank has a plug depth of 1_1/16" . 
For ref ,MT2 has a taper per foot of 0.59941.
A simple measurement of the dia at the open end end of the spindle socket should give an idea of what the taper is . MT1 dia would be 0.475" & MT2 dia would be  0.700". If there's no step in the taper then a std. MT2 may fit as suggested by Stub Mandrel .
John Macaulay20/07/2010 13:45:38
4 forum posts
Hi Guys
 
I may have thrown you a red herring with this post.
 
Firstly I checked the specification and it says
Head spindle taper  MT. 1.5
Tail spindle taper Morse taper #1
 
I assumed MT stood for morse taper!!!
 
Secondly I checked the centre from my headstock and the taper is approx 26:1 while all morse tapers are approx 20:1
 
I have checked all the other known mechanical tapers and none fit that I can find
 
TOYO-ML1 made by SAKAI Special MFG Co Ltd made in Japan and I believe imported by Record   I need an exact specification for the taper

Edited By John Macaulay on 20/07/2010 13:46:58

Keith Long20/07/2010 14:04:54
883 forum posts
11 photos

Hi John

Have you looked at Brown & Sharpe taper specs? They are generally 24:1 so much nearer to your 26:1, you'll probably need some very accurate measuring to be certain.

Keith

NJH20/07/2010 15:04:50
avatar
2314 forum posts
139 photos
Hi there
 
Well Tony Griffiths states on his site  - ( http://www.lathes.co.uk/toyo/page3.html ) -that the Toyo-ML1   "  ...carried an unusual  size of Morse taper in the nose - a 1.5."
 
You could give him a call?
 
Norman
John Macaulay20/07/2010 18:20:20
4 forum posts
Hi Guys
 
I think I have cracked it!! Turning my attention to the socket, a 1.5MT should be 14.92 mm at the mouth.  Puting the centre in and calipering against the spindle face gives a dimension of 13.45 mm.  Re-examining the taper, the centre had some relief at the front end, the taper is approximately 20:1, so it is a Morse taper.  I can accept that the mouth dimension is not an exact 1.5 but the intension was there and it is difficult to measure, probably more so in production.   Thanks to everyone for making my think harder.  It is a super little lathe that sits nicely with my PROXXON PD230/e (most tooling is interchangable), and of course my Wabeco D6000.
 
Thanks again
Neville Chase17/07/2012 11:55:44
29 forum posts

Draging up an old thread here in the hope that John is still around. If you are John, do you still have the Toyo Manual. Lost mine,so hopefully I can get it from you again.

Nev.

Neville Chase27/07/2013 02:01:38
29 forum posts

Bump! Still looking for John or anyone that has the Toyo Manual.

Thanks

Nev.

John Macaulay27/07/2013 07:20:27
4 forum posts

Sorry to all who have sent messaages and not had a reply. I have attended to them now. It would seem that the Proxxon 230/E ia a modern equivalent for the TOYO ML1. I have all the attachments for the Proxxon so can check if they fit the TOYO. Try contacting me on [email protected] if you want to check before you spend.

Neville Chase19/08/2013 23:33:59
29 forum posts

Thanks for resending the Toyo Manual John.

Nev.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate