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

never seen anything like it

Reamer

All Topics | Latest Posts

Search for:  in Thread Title in  
Speedy Builder512/06/2011 20:45:42
2878 forum posts
248 photos
Just picked up some new French metric (I guess the same as UK metric - just French made !) reamers from a car boot sale. I have never seen reamers like it, but was assured that they will cut accurate holes in steel, brass etc.
 
A third of the circumference have no cutting flutes, and the other two thirds have normal flutes. Anyone used / seen these before ?
Speedy Builder515/06/2011 18:56:42
2878 forum posts
248 photos
344 other people never seen anything like it - surely some one knows.
Andrew Johnston15/06/2011 19:18:06
avatar
7061 forum posts
719 photos
Since there are no pictures, technically you're the only person who has seen it!
 
Regards,
 
Andrew
Roderick Jenkins15/06/2011 19:58:40
avatar
2376 forum posts
800 photos
Robert,
 
Taper reamers for making the holes for musical instrument pegs have only 3 flutes on half the circumference, the rest being plain. If you try to cut a hole in a soft material like wood using a conventional reamer the reamer tends to pivot around the cutting edges in turn and you end up with a facetted hole. I guess a similar thing can happen in soft metals, it certainly can happen in sheet material. I would expect your reamers to be very accurate, if a little slow cutting. Spiral flute reamers are now available for musical instrument which helps to eliminate the problem but they still have a least one flute missing (or at least that's how it is on my lute peg reamer).
 
Rod
dcosta15/06/2011 20:43:09
496 forum posts
207 photos

Hello Robert!


When I started my intereste in engineering, in the beginning of the eighties, I saw reamers like that many times in professional shops. At that time I heard they being called something like “backed reamer”. In its name (that in portuguese is descriptive of the reamer, not just a name), the third of the circumference without cutting flutes is the “backed” part of the reamer. I think they were of common use here in Portugal.

I've used one or two and, yes, they work very well.

Only now I thought about how that reamer work. I think that the function of the “backed” part is to crush small bosses left by the normal flutes and also to (kind of) polish the surface.

I only recently re-started my interest in engineering and in the meatime I think I lost them. Tried to find them with no luck.


Best regards
Dias Costa

Chris Trice15/06/2011 22:26:09
avatar
1376 forum posts
10 photos
Bit of a cross between a reamer and a D-Bit maybe.
Nobby15/06/2011 22:38:23
avatar
587 forum posts
113 photos
Hi
If the reamed hole is a bit small .On the 1/3 plain section you can add say .001 shim etc.& ream by hand.Having said that I havent seen them
Nobby
JohnF17/06/2011 00:04:31
avatar
1243 forum posts
202 photos
Hi Robert,
Yes I have used this type of reamer some 40 years ago in industry, they often came with carbide inserts in the plain portion to prevent wear--always with a carbide cutting tip as well. They are a little slow cutting and you really need to flood with coolant or oil and run relatively slow.
They cut a very straight hole and yes they operate similar to a D bit but cut faster and more efficiently. If memory is good they were designed by PERA [production engineers research organization] They never caught on with the major tool makers and I have seen few since--still have a couple somewhere I think!
Regards John

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