Author Topic: "Cutting" knurling tool anyone ?  (Read 18585 times)

Offline awemawson

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"Cutting" knurling tool anyone ?
« on: September 30, 2013, 09:12:55 AM »
Knurling tools come in various flavours. There are the single and double wheel types that are just pressed hard into the work and load the lathe bearings and cross feed screw horribly. There are the clamp types that squash the two knurls into the work so that the force is taken by the tool and not the lathe. Then apparently there is the 'cutting knurling tool'

Seems that this variety tilts the knurl axis so that the leading edge is ahead of the trailing edge as far as penetration into the work is concerned, and rather than plasticaly  (sp.) deforming the work it actually cuts it. Several Youtube advertising videos but very light on technical details.

Anyone familiar with these knurling tools and can enlighten me ?
Andrew Mawson
East Sussex

Offline DaveH

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Re: "Cutting" knurling tool anyone ?
« Reply #1 on: September 30, 2013, 09:55:48 AM »
The cut knurling tool is far superior to any of the 'force in' knurling. Tends to produce excellent knurls but it does have one draw back they are oh' so expensive.
It is probably the cost that tends to put it out of reach for the home workshop.
 :beer:
DaveH

(Ex Leicester, Thurmaston, Ashby De La Zouch.)

Offline awemawson

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Re: "Cutting" knurling tool anyone ?
« Reply #2 on: September 30, 2013, 10:00:01 AM »
Dave yes - that's why I'm trying to get as much gen as possible and make one  :ddb: After all the actual knurls themselves are available as spares so it's only the body at issue. I'm sure the big makers won't mind little old me copying their tooling, after all imitation is the best form of flattery  :clap:
Andrew Mawson
East Sussex

Offline DaveH

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Re: "Cutting" knurling tool anyone ?
« Reply #3 on: September 30, 2013, 10:15:13 AM »
I have never made one, only used and abused them  :lol:
They also take a bit of setting up so for 1 off's can be a bit off putting. Your lathe needs to be rigid and I have only used them with flood coolant, may be they can be used with out flood coolant that I don't know.
 :beer:
DaveH
(Ex Leicester, Thurmaston, Ashby De La Zouch.)

Offline awemawson

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Re: "Cutting" knurling tool anyone ?
« Reply #4 on: September 30, 2013, 10:25:32 AM »
This'll be for the Traub, so with an 18 kW main spindle and weighing over 4 tons with 320 litres of flood cooling when full I don't expect those to be issues  :lol:
Andrew Mawson
East Sussex

Offline DaveH

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Re: "Cutting" knurling tool anyone ?
« Reply #5 on: September 30, 2013, 10:27:27 AM »
Nope, that will not be an issue  :lol:
 :beer:
DaveH
(Ex Leicester, Thurmaston, Ashby De La Zouch.)

Offline DaveH

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Re: "Cutting" knurling tool anyone ?
« Reply #6 on: September 30, 2013, 10:29:46 AM »
I also think it would be a very nice tool to make, certainty a lot of fun and satisfaction in making one  :thumbup: 
 :beer:
DaveH
(Ex Leicester, Thurmaston, Ashby De La Zouch.)

Offline earl

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Re: "Cutting" knurling tool anyone ?
« Reply #7 on: September 30, 2013, 10:57:51 AM »
Hello,  There was an excellent series of build articles in Home Shop Machinist magazine some time ago on a cut knurling tool.  Got started on it, but not finished.  Regards,  Earl

Offline awemawson

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Re: "Cutting" knurling tool anyone ?
« Reply #8 on: September 30, 2013, 11:00:44 AM »
Thanks Earl - are they available on line as I haven't seen a copy in many a year this side of the pond
« Last Edit: May 14, 2018, 05:16:06 PM by awemawson »
Andrew Mawson
East Sussex

Offline John Stevenson

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Re: "Cutting" knurling tool anyone ?
« Reply #9 on: September 30, 2013, 01:08:36 PM »


Anyone familiar with these knurling tools and can enlighten me ?

Yes..........
John Stevenson

Offline BillTodd

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Re: "Cutting" knurling tool anyone ?
« Reply #10 on: September 30, 2013, 02:02:31 PM »
I have a copy of a hardinge one - it works very well when it works but, is it a real PITA to set up.

Getting to two wheels to bite exactly the right  amount requires several adjustments - angle, centring , etc.

There are expensive versions that speed the adjustments but all require rehearsal passes so are better suited to production then the homeworkshop. IMHO.

 
Bill

Offline Jasonb

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Re: "Cutting" knurling tool anyone ?
« Reply #11 on: September 30, 2013, 03:23:23 PM »


Anyone familiar with these knurling tools and can enlighten me ?

Yes..........

Is that once you have read Daves article in MEW? :D

Offline John Stevenson

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Re: "Cutting" knurling tool anyone ?
« Reply #12 on: September 30, 2013, 04:01:03 PM »
Dave based it on one I have, many emails fasted both ways before that article was written.
I have a Quick model and they are, used to do 2" stainless bar 700 rpm, 1500mm long at ****thatwasfast mm/min
« Last Edit: September 30, 2013, 04:16:14 PM by spuddevans »
John Stevenson

Offline earl

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Re: "Cutting" knurling tool anyone ?
« Reply #13 on: October 01, 2013, 10:50:58 AM »
Will see what i can find, will take a few days.  Regards,  Earl

Offline NeoTech

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Re: "Cutting" knurling tool anyone ?
« Reply #14 on: October 02, 2013, 02:34:54 AM »
I found these by accident and remembered this thread..
Sorry for cross posting forums and sites..

http://www.practicalmachinist.com/vb/general/cut-knurling-how-done-138092/index2.html
http://www.gadgetbuilder.com/Cut_Knurler.html

But he shows a tool that can be made using straight knurling wheels to produce a diamond pattern by cutting with them instead of shoving the material around.
Machinery: Optimum D320x920, Optimum BF20L, Aciera F3. -- I have not failed. I've just found 10,000 ways that won't work. http://www.roughedge.se/blogg/

Offline awemawson

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Re: "Cutting" knurling tool anyone ?
« Reply #15 on: October 02, 2013, 02:44:34 AM »
Thanks Neo, I'll follow that up
Cheers
Andrew
Andrew Mawson
East Sussex

Offline Arbalist

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Re: "Cutting" knurling tool anyone ?
« Reply #16 on: October 02, 2013, 04:29:10 AM »
Thanks for the links Neo. I wonder how much those straight knurl wheels cost?

Offline NeoTech

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Re: "Cutting" knurling tool anyone ?
« Reply #17 on: October 02, 2013, 04:46:25 AM »
I picked up a pir from rdgtools for like 15£ a while back.. been laying in a drawer since.
Machinery: Optimum D320x920, Optimum BF20L, Aciera F3. -- I have not failed. I've just found 10,000 ways that won't work. http://www.roughedge.se/blogg/

Offline awemawson

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Re: "Cutting" knurling tool anyone ?
« Reply #18 on: October 02, 2013, 05:05:57 AM »
If you'd like to turn them into negotiable currency say the word  :ddb:
Andrew Mawson
East Sussex

Offline NeoTech

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Re: "Cutting" knurling tool anyone ?
« Reply #19 on: October 02, 2013, 05:35:41 AM »
ooh im gonna use em someday.. i have like 4 large projects ongoing though.
Machinery: Optimum D320x920, Optimum BF20L, Aciera F3. -- I have not failed. I've just found 10,000 ways that won't work. http://www.roughedge.se/blogg/

Offline Jonny

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Re: "Cutting" knurling tool anyone ?
« Reply #20 on: October 02, 2013, 04:28:35 PM »
Seems like all the replies refer to knurling as in straight knurls on lengths of round. Above tools are limited to just that.

Offline awemawson

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Re: "Cutting" knurling tool anyone ?
« Reply #21 on: October 02, 2013, 05:19:14 PM »
My understanding is that the two knurls are 'straight' ones, but they are angled to cut a helix which if set up right meet at 90 degrees forming a diamond knurl.

To cut a 'straight' knurl, an angled cut wheel is used in a single wheel holder, again set at an angle to the holder.

..... but what do I know .... I was the one asking questions originally, it's only what I've learnt in the last few days  :wave:
Andrew Mawson
East Sussex

Offline John Stevenson

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Re: "Cutting" knurling tool anyone ?
« Reply #22 on: October 02, 2013, 05:33:09 PM »
Correct.
The angle of the twist also determines the diameter that is cut.
If you don't get it right they don't cross at 45 degrees but in many cases it's not noticable.

The knurls wheel really need to be recessed with top hatted axles so you can get as close as possible to shoulders.

looking for a link to the wheels but gotta post this as need to shut down, relad the latest flash and reboot.

I have to do this about 3 times a week Adobe like Norton wants listing as a virus.

Come back to edit in  a bit.

Page 388 in the J&L catalogue, bottom of the page are two side knurling tools, these are the wheeels you want.
The wheels are on page 389 down the bottom, type 5.

There are some TiN coated ones for pig farmers with deep pockets on a previous page.

http://www.mscdirect.co.uk/CGI/INPDFF?PMCTLG=00&PMPAGE=387&PMITEM=BMK-42080M

No idea what they are like, us mere mortals can't afford these.
« Last Edit: October 02, 2013, 05:57:45 PM by John Stevenson »
John Stevenson

Offline Gadabout

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Re: "Cutting" knurling tool anyone ?
« Reply #23 on: October 03, 2013, 01:33:06 AM »
Andrew ,
There was one described in "The Home Shop Machinist" March/April 2010 edition

cheers
Mark

Offline Jonny

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Re: "Cutting" knurling tool anyone ?
« Reply #24 on: October 03, 2013, 06:29:28 AM »
See what you mean John from £43 each plus vat.
Fairly local to me I only buy whats on offer from there which often is still dearer than shopping around. Used to have some good sell offs.