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

Machining Strange materials

All Topics | Latest Posts

Search for:  in Thread Title in  
Richard Parsons01/04/2011 18:00:06
avatar
645 forum posts
33 photos

I am considering making the ‘Eureka’ by Artificer (published M.E. Feb 1949) as my late summer project –If (and in Hungary it is a big If) I can get all the materials-.


I think that there is a problem with artificer’s design. This is the Coil which is wound within the ‘balance wheel’. This could cause both static and dynamic imbalances. To overcome this I am thinking of replacing it by a permanent magnet.


I have never machined un-magnetised Samarium magnets and ferrite bars. Can anyone give me help on how to do it?

John Olsen01/04/2011 23:19:59
1294 forum posts
108 photos
1 articles
I don't know about samarium cobalt, but I beleive the ferrite is best cut with a diamond saw. I haven't done this myself, but there was a book published locally on building an alternator for alternative energy use, and that is how he cut the ferrite magnets he used.

regards
John
Clive Hartland02/04/2011 09:07:22
avatar
2929 forum posts
41 photos
I would think a Diamond saw would be the only thing that would cut it.
The other problem may be holding it as pressure can crack it.
I had to grind a component that had two glass prisms attached, the problem was heat, I cooled it with a drip of suds and went very carefully as each item cost in excess of £500.
 
Clive
Gordon W02/04/2011 09:55:55
2011 forum posts
Like the above people I've never tried cutting samerium magnets, never heard of it before. Have tried turning ferrite rod with brazed carbide tip, did about 10 mm before the tip was scrap, and the finish was awful. Cut ok with a thin disc in angle grinder. I do know there are many different mixes ,but have no idea whats what.
Sam Stones03/04/2011 03:17:28
avatar
922 forum posts
332 photos
Hi Richard,
 
Please have a look at the thread titled Graphite Bushes. Go down to my posting date/time 19/07/2010 06:42:51
 
I mention the problem I had with glass-bead filled plastic material, when beads found their way under and jammed the ML7 saddle.
 
I can imagine the problems if the material was in any way magnetic.
 
Good luck,
 
Sam
 
 
Andrew Johnston03/04/2011 11:43:20
avatar
7061 forum posts
719 photos
Hmmmm, according to Wikepedia dry samarium cobalt powder has a low ignition temperature. If it does catch fire it will be very difficult to control; presumably like most metal fires.
 
In essence both these materials are very hard (mechanically) but also very brittle. As has been stated they can only be machined by grinding. Samarium cobalt is also hard magnetically, while ferrite is usually soft magnetically.
 
Regards,
 
Andrew
Richard Parsons03/04/2011 12:57:39
avatar
645 forum posts
33 photos

I would like to thank everyone for their help. It is always a good idea to ask those who know about such things and have been there, done it and got the ‘Tee’ shirt, first.


Andrew I became aware of that point. Cobalt is similar to Nickel. Which in has an alloy (with aluminium) called ‘Raney Nickel’. It is very pyrophoric.


The problem with Eureka is that is that it is not a true Hipp movement. The impulse is given irrespective of the degree of oscillation of the balance wheel.


‘Hum Ho’ ‘That ‘cat won’t jump’ so back to the bakky-pipe and the drawing board!


Once again thanks to everyone who has helped.


Regards


Dick

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