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Rotary broaching - the easy way

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Michael Cox 119/09/2011 18:24:37
555 forum posts
27 photos
I have developed a tool for rotary broaching that is very simple to make. It also facilitates making the required cutters. Further details are here:
I hope this is of interest to other members of this forum
Mike
alan frost19/09/2011 23:01:37
137 forum posts
3 photos
Certaqinly was-don't know when but thanks-very clearly written and photographed.
ady20/09/2011 00:11:40
612 forum posts
50 photos
Your running centres are dead cool.
All interesting stuff.
modeng200020/09/2011 06:46:05
340 forum posts
1 photos
When hardening silver steel wrap the tool bit with iron wire to make a loose cage and rub softened soap between the wire loops. It does save a lot of cleaning up before the tempering. Leaving the iron wire long enough gives a handle instead of using tongs.
 
John
Ramon Wilson20/09/2011 08:03:17
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1655 forum posts
617 photos
Michael, What an excellent informative description of making this useful bit of kit.
 
I have only recently been aware of how such tools work but the ease of which your tool can be made makes it a very attractive proposition.
 
It appears your tool post is based on an expanding mandrel principle - does it have a single taper or is it expanded top and bottom?
 
Regards - Ramon
Michael Cox 120/09/2011 08:15:13
555 forum posts
27 photos
Hi Ramon,
The tool post is a simple cylinder, with six vertical cuts at 60 degree intervals, that is expanded by a cone at the top.
Mike
Peter Hall20/09/2011 09:41:23
115 forum posts
1 photos
Mike, that's an impressive website you have there. Useful too. I have been inspired by your milling machine table stops to fit something very similar to my little X1 mill, so thank you for that.
 
At the risk of hijacking your thread slightly, can anyone recommend a supplier for the iron wire that John mentions? I could do with keeping some in stock.
Ramon Wilson20/09/2011 09:42:51
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1655 forum posts
617 photos

Thanks Mike, I was looking for a simple, ie easily made, type and this fits the bill perfectly. I have an old Unimat that has been dragged from under the bench for machining very small plastic parts - it comes hard setting up each tool having been used to a Dickson QC on the Myford
 
Regards - Ramon
Michael Cox 120/09/2011 10:19:09
555 forum posts
27 photos
Hi Ramon,
There is write up of the toolpost, including dimension drawings, in MEW 158 (Dec 2009) entitled "A novel quich change toolpost".
Mike
Michael Cox 120/09/2011 10:26:37
555 forum posts
27 photos
Hi Peter,
Thin iron wire is readily obtainable from most florists. It is used in arranging flowers as stem supports etc.
Mike
Peter Hall20/09/2011 12:37:58
115 forum posts
1 photos
Thanks, Mike. I can pick up a bunch of freesias for Mrs Hall while I'm there. Two birds, one stone.
 
Pete
jacques maurel20/09/2011 16:03:49
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84 forum posts
20 photos
read my article about "polygonal punching tool" in ME N°4310 oct 2007 it gives informations about the hole to drill before punching.
J Maurel
Michael Cox 120/09/2011 22:22:37
555 forum posts
27 photos
Posted by jacques maurel on 20/09/2011 16:03:49:
read my article about "polygonal punching tool" in ME N°4310 oct 2007 it gives informations about the hole to drill before punching.
J Maurel
Hi Jaques,
Thanks for your message. I do not have access to back copies of ME. Could you send me a copy. PM me if this is possible.
Mike
Michael Cox 128/09/2011 21:44:05
555 forum posts
27 photos
I have made some modifications to my rotary broaching tool and added a link to a video of the tool in use, see:
Mike
guri alley06/05/2016 07:33:32
3 forum posts

Hey guys, I have bought a very good quality round broach. If anyone requires any type of broach, you can buy from Broach India. I am sure you will be satisfied.

Edited By guri alley on 06/05/2016 07:34:56

Edited By guri alley on 06/05/2016 07:35:16

David Colwill06/05/2016 08:48:31
782 forum posts
40 photos

By a complete coincidence I ordered a couple of phosphor bronze bushes (which came yesterday) to make my version.

Owners of the T2 style toolpost set will recognise this item

dscf2670.jpg

and with bush fitted.

dscf2671.jpg

It hardly counts as a build smile p

David.

John Hinkley06/05/2016 09:25:51
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1545 forum posts
484 photos

Posted by Guri Alley:

"Hey guys, I have bought a very good quality round broach. If anyone requires any type of broach, you can buy from Broach India I am sure you will be satisfied."

Am I getting more cynical in my old age, or is this a blatant bit of advertising?

John

John Stevenson06/05/2016 09:33:09
avatar
5068 forum posts
3 photos

Not sure John, but he's on the watch list.

3 posts, one could be an advert and the other two are generic. So we will see what happens.

If it is advertising then no one is going to buy off the Indians anyway, unlike Aliexpress they don't have a sales vehicle in place and who on this forum is liable to buy a special broach when they get more enjoyment spending 5 weeks and 5 bean cans to make one ?

Michael Gilligan06/05/2016 09:33:49
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23121 forum posts
1360 photos

John [Hinkley]

Have you used the 'Report' feature ?

[orange flag, at bottom-right of post]

MichaelG.

.

Edit: Probably not needed now, since a Moderator has already commented.

Edited By Michael Gilligan on 06/05/2016 09:36:22

Ed Duffner06/05/2016 09:53:47
863 forum posts
104 photos

A big thank you from me also. It was Mike's article that made me realise the 1° offset did not have to be built into the tool.

Ed.

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