Needs Pictures: 0
Results 1 to 7 of 7
Thread: Chaser grinding attachment
-
21st Aug 2021, 04:53 PM #1Senior Member
- Join Date
- Nov 2019
- Location
- Brisbane
- Age
- 69
- Posts
- 452
Chaser grinding attachment
SAM_0824.jpgSAM_0823.jpgHello from the Old goat again.
Today a nice bloke dropped in and and handed over an unknown gadget. It tool a bit of nutting out but it is a jig for grinding coventry die head chasers. Once again I think as old as me and like new. My comment after realising what it is , it's missing the rake adjustment thingy's. later when cleaning the storage shyte off it I saw the base is labelled for different rakes. Move the inner bit sideways and it slots into a different position. My guess would be it is meant for a surface grinder.
A much appreciated addition to the shed.
Regards
BC
-
21st Aug 2021, 06:39 PM #2
Hi BC,
There won't be many of those jigs about ! They were not only very expensive but awkward to use. It was cheaper to buy a new set of dies.Best Regards:
Baron J.
-
22nd Aug 2021, 10:09 AM #3Senior Member
- Join Date
- Nov 2019
- Location
- Brisbane
- Age
- 69
- Posts
- 452
Chasers
Hello again.
It must be different for supply of chasers over there. They have always been expensive here and sometimes short in supply. From looking at the fixture all 4 chasers are mounted at the same time and the chamfer ground with a 1A1 wheel that is dressed to the correct angle. I would quote 8-10 mins. My tap grinding fixture finishes a 4 flute tap in similar time now that I have used it a bit.
HSS tools are expensive in Aus. A 1/2" drill lists at $40.00 and Viking in USA lists the same at $7.50. This makes regrinding once again a good proposition.
regards
BC
-
22nd Aug 2021, 05:35 PM #4
Hi BC, Guys,
Tracy Tools here in the UK currently supplies packs of Coventry dies and also holders for single dies to use as chasers ! I gave away my large, 1" inch die head and only have a 1/2" inch one now and a few dies for it. I haven't used it for years.
Some time ago I did use one of the dies held in the lathe tool holder to cut some 1/2" Whit studs for a guy to replace some on his traction engine.Best Regards:
Baron J.
-
22nd Aug 2021, 09:24 PM #5Most Valued Member
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 9,088
I have a fixture for (I believe) doing the same thing but is very different. For different sized heads perhaps?
It also has positions for another operation??
Never had the need to use it as yet but I do now have a set of die heads so its day may come.
-
23rd Aug 2021, 03:49 PM #6Senior Member
- Join Date
- Nov 2019
- Location
- Brisbane
- Age
- 69
- Posts
- 452
Chaser grinding
Hi from BC.
What you have https://www.threadtools.com/uploads/...r-grinding.pdf
there is the Mk 2 version. It should be marked with a deg scale on one end. Have you got the edge height gauge for it? It is needed to check the height after grinding. Have a laugh at my ability to insert a link. The link leads to good info on grinding chasers.
Regards
BC
-
24th Aug 2021, 03:46 PM #7Most Valued Member
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 9,088
Close, but that's not it.
I had guessed it did both right and left hand sets as although it doesn't show in the pictures, one set of fixtures show many grinding "oops", the other set barely has a mark.
Thanks for the PDF. Might take me awhile to get my head around how mine is different.
Based off the pictures I had a closer look at mine.
It appears to be German.
Hard to make out, part words
BRUST=chest(throat maybe?)
LINKS=left
ANSCHN=sniff(ok no idea on that one, rakes would be a nice match.)
RECT =right
RE HIS =also right
And I assume a manufactures mark EFEM
Will have another look later with some better gear.
Similar Threads
-
Tap grinding attachment
By steamloco1954 in forum METALWORK GENERALReplies: 0Last Post: 29th Jun 2021, 08:35 AM -
gmf- douglas drill grinding attachment instuctions
By dodge at4 in forum METALWORK GENERALReplies: 8Last Post: 19th Dec 2020, 06:55 AM -
Tool grinding: Form cutter sharpening attachment
By WoodBee2 in forum METALWORK GENERALReplies: 5Last Post: 28th Jan 2016, 04:55 PM -
What brand is this - tap & reamer grinding attachment
By steran50 in forum METALWORK GENERALReplies: 4Last Post: 25th Dec 2012, 08:30 AM -
Cutter Grinding Attachment
By Anorak Bob in forum METALWORK GENERALReplies: 6Last Post: 1st Aug 2011, 10:58 PM