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

Taper cutting

Set Over Method

All Topics | Latest Posts

Search for:  in Thread Title in  
<< First < Prev 1 2
mgj15/11/2009 12:18:55
1017 forum posts
14 photos
There is of course another way.
 
Set all dead straight.
 
Off set the topslide. to the right angle.
 
Measure accurately  the thick dia and the thin end.
 
Turn two short tapered  collars to size and take a groove out between the collars.
 
Its going to be difficult to get it dead right, so some adjusting with emery, oil and engineers blue is going to be necessary, but it will do it without all this chatter bit, and use of bell -ends.  (I have a couple - lucky me!. Arc Eurotrade do them)
 
You can always test by taking the whole chuck off - don't loose true centre.
 
Last alternative.  - Hemingway - taper turning attachment.  Make - fit  - use. Recommended - gets over all these problems. You can extend it too, so its long enough to do loco rods and traction engine con rods etc. (I wasn't going to pay for a Myford one)
John Stevenson15/11/2009 12:29:36
avatar
5068 forum posts
3 photos
It's not a problem even with large chunks of metal, you just need bigger balls.
 

To give an idea of size that's a 6" centre hight lathe. Ironically it is equipped with a taper turning attachment built in but I use the old boring head method most of the time for tapers that can't be handled by the topslide.
 
Main reason is it's a lot easier to adjust to get the correct taper. I NEVER move any of my tailstocks over, can't see the point of upsetting something that took ages to achieve when there are other methods.
 
John S.
 
John Stevenson15/11/2009 12:32:18
avatar
5068 forum posts
3 photos
Can't edit these post but i meant to say that this arrangement will fit any lathe whether it has taper turning or not.
So you can swap between machines if needed, Bonus is that you can always use it as a boring head as well.
 
John S.
chris stephens15/11/2009 13:29:42
1049 forum posts
1 photos
Hi Hilton,
Just a thought but do you need a full length Morse taper, if it is a bit short in most cases it will still work, well enough. Then you could just use the top slide.
Another thought, (must have had fish for breakfast, eh Jeeves?) Beg, borrow, or scan a copy of MEW27 on pages 51-54, where  Mr. Ron. Bentley explains how to make a "Tangential Skiving Tool" for cutting Morse tapers, well worth a read.
chriStephens
chris stephens15/11/2009 14:36:20
1049 forum posts
1 photos
Hi Ian S C.
The material he is using seems to have turned OK when he turned it parallel, so it should turn taper too. 
From personal experience, there is a tendency to use very small cuts when taper turning, and this might lead to surface work hardening (depending on material), thus increasing the difficulty. What is needed for final sizing cuts is a tool described in ME sometime in the fifties, which is a front cutting "shearing" tool. This tool for the experts to ponder, is a tool of infinite radius, but with a point contact. 
Anyway, this dead simple tool is a great way of making your own wire wool! Get my drift?
I used mine recently to make a less than 0 Morse taper for a rotating centre to fit a Super Adept. seemed to work on that cutting Stainless.
If the moderator agrees I could post a scan, to save you lot having to delve in the archive, if anyone is interested.
chriStephens
mgj15/11/2009 15:59:29
1017 forum posts
14 photos
Be interested to see it Chris.
 
--------------------------------.
 
If I could make one final suggestion - if you ever do get this taper sorted and cutting OK, for Gods sake make more than one at the same setting.
Ian S C16/11/2009 01:42:28
avatar
7468 forum posts
230 photos
Chris,I think the tool use are talking about is one that looks something like a D bit and when mounted is horizontalfore and aft and tilted about 45deg to the left(ie to the chuck).Some grind the end at rt angles to the tool shank,others the end is a slight curve,same efect which ever.IAN S C
Ian S C16/11/2009 01:42:32
avatar
7468 forum posts
230 photos
Chris,I think the tool use are talking about is one that looks something like a D bit and when mounted is horizontalfore and aft and tilted about 45deg to the left(ie to the chuck).Some grind the end at rt angles to the tool shank,others the end is a slight curve,same efect which ever.IAN S C ps easyest to use round tool stock to make the tool,easyest to set up in lathe.

Edited By Ian S C on 16/11/2009 01:45:34

chris stephens16/11/2009 02:13:52
1049 forum posts
1 photos
Hi Ian S C,
Sounds like you have it aright. 
The tool comes in many variations, there is a Yankee chap who uses square stock, but the round stock is slightly more versatile as you can alter the contact area  more easily. 
Tried posting to Meyrick as a PM from "My Documents" but could not get it to work, had to send it direct. If there is any interest, perhaps he could get his 'puter to work better than I can mine.
chriStephens
Jim Whetren16/11/2009 11:09:32
50 forum posts
1 photos
Finishing Tool.
 
I have been using this tool for finishing since I saw it in 'Using the Small Lathe' by L C Mason. It is simple to make from round HSS.
 
The only proviso is to take very light cuts, in the order of a thou' or so.
 
If it helps anyone, look at page three of the past articles on this site where there is a photo of one in action in the 'Graduating to Better Scales' article, and an example of the finish obtained in the 'Hand Turning Rest' article.
 
The advantage of the round tool is that; although it is usually set at about 45 degrees, it can be presented more vertically when approaching a shoulder.
 
Ditch the emery..
Jim
chris stephens16/11/2009 13:03:13
1049 forum posts
1 photos
Hi Jim,
Indeed it is, but you can also raise the tool so that it cuts just above the bottom corner( if you have a QC tool holder) if you are planning to cut up to a shoulder.

Ditch the Emery indeed, but sometimes a wipe with Scotchbrite type abrasive (ultra fine grade) texture-izes the surface to a uniform polished finish.

You can also use a Tangential tool to give the same effect by raising the cutting edge half- three quarters of a smidgeon, and cutting backwards.

Do you agree about making your own wire wool?
chriStephens
Jim Whetren16/11/2009 13:30:08
50 forum posts
1 photos
Hello Chris,
 
Yes, as Mr Mason describes it; the swarf comes off like cobwebs.
 
I also agree with raising the tool in a QC-TP to reach a shoulder, and the use of Scotchbrite.
 
Was there ever an original thought in our hobby?
 
Jim
chris stephens16/11/2009 13:40:16
1049 forum posts
1 photos
Hi Jim,
Yes of course there was, 1673 if memory serves, that's BC, by the way, not AD.
'Tis true there are very few new ideas, just up dates of previous ones. When new materials come along that can start people thinking along new lines, but truly original thought is fairly rare. (and not to be recommended if you are a politician)
chriStephens
<< First < Prev 1 2

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