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Old 08-14-2017, 01:18 PM   #1
bazmak
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Default Knurling tool photos for Kerrin Galvin

Kerrin wants to make a knurling tool.I am not sure what photos are still
accessable so will post a selection and answer any questions.Anyone else
wants to make one please ask thru this threadClick image for larger version

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Old 08-14-2017, 09:51 PM   #2
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That is a neat tool storage system!


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Old 08-14-2017, 09:54 PM   #3
Kerrin Galvin
 
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Hi Bazmak,
Thanks for posting up the pictures. They are a big help! Question for you, it appears that you have offset the setscrews towards the outer end, giving clearance at the tool holder end.....understandable, at a guess 3 mm? Also back from the working face 1.5 or 2 mm? Also understandable as if the wheels are centered they will over hang the block 1.5 mm.

Cheers Kerrin
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Old 08-14-2017, 11:43 PM   #4
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Nothing is very important but the wheels are just clear of each other
and do not rub.If the wheels are further apart then they may cut better
but not cut small dia bar.I was very happy with what is shown and did not experiment any further. I call the 2 parts the knurl head and holder
The knurl head is turned from 25mm sq bar to 16 dia x 10 long and drilled
6.5 clear for M6 alllthread. The 25mm sq is lightly cleaned and faced to nom 25lg. The pivot fixings are 14mm from mounting face and 7mm from the front
to give wheel o,hang at the front of 7mm and rear clearance of 4mm
Non of which is very important.The boby has various forms to suit the lathe and toolholder.I made 1 for the small qctp and 1 for the large qctp and 1 to clamp in
a std 4 way toolpost. Also a solid block one nom 40mm sq to sit on the
clamping pin on the compound.Whatever suits you. It is important to get the knurl wheels that have a sharp corners as that is what doues all the work
Some have radius corners and would be no good.Although mine show no signs of wear they could easily be ground on the flat faces to renew the corners.I bought on Ebay a single wheel knurling tool that came with 3
sets of wheels and then bought another pitch pair to give me a full set
All for about $20. When you make the knurl head make 3 or 4 and fit the wheels.Then you only have to undo the m6 knob to change the wheels
My first one i made shouldered studs from cap screws but later made brass top hat bushes and used smaller fixing button head cap screws.Will post further photos when i find them. Regards Barry
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Old 08-15-2017, 06:15 AM   #5
Kerrin Galvin
 
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Hi Barry,
Thanks for the details! You have confirmed what I was thinking. I have a block that would make a holder, but will look at making a quick change holder as well.

Cheers Kerrin
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Old 08-15-2017, 08:01 AM   #6
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found another photo showing the brass bushes.The last description was incorrect in regards that the knurl head is drilled and tapped for M6 and
the holder drilled clear for M6 althreadClick image for larger version

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Old 09-29-2017, 06:50 AM   #7
Kerrin Galvin
 
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Hi Barry & All,
Almost finished my knurled to Your design!
So here's the pictures....
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This is a block I started on to make a QCTH out off then thought better of it & brought one! So time to make use of it. So I measured up all my holders & drew them up in CAD & off to see my local water cut guy! He pointed out that time on the table costs, so if I could reduce the thickness I'd save, so back home & on to the bandsaw....
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Not long latter
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A few days latter...
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You will see that on the left side it doesn't look great, the cause was the jet run out at end of cut, fixed with a couple of strokes of the file! If I had it cut from plate it would of been fine.
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Here's the tool holders, made as a pair, & my hi tech linisher for the clean up!
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Here's a family shot so far! The main holder has be cut down to size...I love my bandsaw!...drilled thru 6.1mm, counter bored 16 mm x 11 deep, the tool holder "posts" are 16mm x 10mm long

The next 3 shots show how I set the tool holders in mill using an ER block & rotating them to 45 degrees to cut the scallop out then set to 78degreess to cut the relief
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More to come

Cheers Kerrin
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Old 09-29-2017, 07:07 AM   #8
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Hi again,
Here's the rest of the photos....
Quick mandrel to hold the brass bushes for final sizing
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The 4 tool holders!
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Setting to center height, you might be able to see the laser dot on the corner of the holder...
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First cut! I put on 0.5mm, 60 rpm & a slow feed...looks pretty good me! This is going to be the nut for the holder
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Hopefully you can also see the swarf that was produced....these really do cut! The swarf coming off the top knurling then gets added to the lower, I had made the brass bushes to give minimal space between the knurl & holder, the swarf got in & locked the lower knurl up! So I took a little off the top hut on the bush, made things much better.
So a question for Barry.....how much space did you allow?
Here's trial two....the first picture show what happens when, on the left the knurls aren't on center, the right after adjusting & the results
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Thanks too Barry for a fun project that I'm sure will get lots of use over the coming years! If you are still think about making one....go for it!

Cheers Kerrin
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Old 09-29-2017, 08:44 AM   #9
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great to see it works ok for you. Try different speeds around 180 and hand feed in then out with a full depth of cut about 30 thou. The knurls only need to set to approx centre,then the screw unlocked to allow the knurls to float to centre
then can be nipped finger tight.A knurled screw or plastic knob works well
So have you made 3 heads for c,m and fine knurls.Looks good keep posted
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Old 09-30-2017, 05:42 AM   #10
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Hi Barry,
Here's the finished knurling tool.
As you can see made 4 heads with 4 different knurls. I just brought the wheels. First thing to make was the locking knob, then the height adjuster for the QCTH
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I'll have a play with speeds & feed when I have time, thanks for the pointers.
Not sure how much use the fine or coarse ones will get but at $15 for the wheels not really an issue. Can always get some other pitches & swap them around.

Cheers Kerrin


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