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Supplier of 7/32" Dowel Pins Please?

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B Tulley22/04/2022 17:18:19
39 forum posts
8 photos

I'm looking for a supplier for two 7/32" dowel pins please (not tapered), 16mm or longer. I want to make my own Knurling tool and the pins will be used as axles for the wheels.

I can easily get them from Boneham at 12p each (the price is right smiley  but then there's £7.50 +vat on top for postage, which makes a couple of dowel pins rather expensive sad

I've tried ebay etc. but 7/32" are a bit thin on the ground. Any suggestions please?

Many thanks,

Brian

DiogenesII22/04/2022 18:02:53
589 forum posts
234 photos

..wouldn't it be cheaper to buy another set of 'wheels (with a more conveniently-sized hole) and base the build around those?

bernard towers22/04/2022 18:03:53
693 forum posts
141 photos

You could try hardening a couple of pieces of EN8

pgk pgk22/04/2022 18:11:29
2605 forum posts
293 photos

silver steel?

I didn't bother hardening the axles on my DIY job .. it doesn't get a huge amount of usage and I figured I’d just swap them out if a problem occurred.

pgk

B Tulley22/04/2022 18:20:15
39 forum posts
8 photos
Posted by DiogenesII on 22/04/2022 18:02:53:

..wouldn't it be cheaper to buy another set of 'wheels (with a more conveniently-sized hole) and base the build around those?

That's an option, but ideally I want 5/8" diameter and not too wide - Chronos have 5/16" wide at a good price with 7/32" holes. RDG's are 3/4" dia. with 1/4" holes - which is easier as regards the dowel pins. A friend managed to find 5/8" and only 3/16" wide, with 1/4" holes, though I'm not sure where from. 1/4" wide would be nice, though I've not seen any yet; price is also a consideration - it's an interesting project but if it gets too expensive it starts to make more sense just to buy a ready-made unit.

As the tool will be used on a Taig (and so on small components) I'm very conscious of not overloading or asking too much of the machine; the tool will be a twin wheel clamp-type device.

Brian

Ramon Wilson22/04/2022 18:49:39
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1401 forum posts
448 photos

Brian - you may find that a dowel pin might be tight in the knurl - dowels being slightly oversize for a given diameter.

My clamp type knurling tool made many years ago still has the original (unhardened) silver steel pins as previously suggested by 'pgk' from when I made it. Whilst I wouldn't say it's done a vast amount of knurling it's certainly done it's fair share over those years without issues and is more than suitable for the task in hand on a small lathe and home usage

Though not answering your question specifically just a thought to consider perhaps

Tug

DC31k22/04/2022 18:54:08
732 forum posts
2 photos

In the same vein as the silver steel suggestion, how about an HSS drill blank of the correct diameter (£3.19)?

David George 122/04/2022 19:51:59
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1874 forum posts
505 photos

Hi Brian I made a knurlingtool from push type to make my clamp type and have changeable rolls for different size cuts using the original pins . I have another which you can have for free as it is not suitable for my lathe. Just drop me a message if you want it.

20190731_104640.jpg

My knurling tool.

spare tool.

David

B Tulley22/04/2022 20:21:05
39 forum posts
8 photos
Posted by pgk pgk on 22/04/2022 18:11:29:

silver steel?

I didn't bother hardening the axles on my DIY job .. it doesn't get a huge amount of usage and I figured I’d just swap them out if a problem occurred.

pgk

Many thanks - Silver Steel had crossed my mind as a Plan 2...

Baz22/04/2022 20:23:47
757 forum posts
2 photos

Buy a length of 7/32 silver steel, you will be able to make a couple of spare sets out of a length. Don’t bother hardening them, if you wear them out put new ones in.

B Tulley22/04/2022 20:24:06
39 forum posts
8 photos
Posted by DC31k on 22/04/2022 18:54:08:

In the same vein as the silver steel suggestion, how about an HSS drill blank of the correct diameter (£3.19)?

Now that is a good idea - I had pondered HSS Drill Shanks but buying two drills and then scrapping them for the shanks seemed an awful waste (and a lot more expensive than drill blank). Many thanks

B Tulley22/04/2022 20:28:08
39 forum posts
8 photos
Posted by David George 1 on 22/04/2022 19:51:59:

Hi Brian I made a knurlingtool from push type to make my clamp type and have changeable rolls for different size cuts using the original pins . I have another which you can have for free as it is not suitable for my lathe. Just drop me a message if you want it.

20190731_104640.jpg

My knurling tool.

spare tool.

David

That's very kind of you David - many thanks. Unfortunately I need to make a simpler version of your own very nice knurling tool as I'll be using it on a Taig/Peatol Lathe and am very conscious of not overloading the (very small) Headstock.

Howard Lewis22/04/2022 20:32:11
6317 forum posts
15 photos

Silver steel was the first thought that came to my mind.

As for chopping the end off the shank of a couple of 7/32" drills, the shanks won't be so short that they could not be used, would they|?

Although, silver steel would still be my first choice.

Used "As is" should give a reasonable life, but if you are worried, the pins could be hardened before assembly.

Howard

DiogenesII22/04/2022 20:42:02
589 forum posts
234 photos

Rotagrip might be worth a call - I know he carries knurls, I've seen 5/8 x 3/16 listed in his Ebay store which I think are 'when he has them, he has them', I think 5/8 x1/4 is a standard industry 'stock' size, as is (I think) 1/2 x 3/16 is; mine are this size.

I've always had found it easier to obtain a passable result with 3/16 wide wheels in my small lathe.

As others have said, I've used (and still have fitted) silver steel pins - nominal dia., cut to length and hardened as is.

Edited By DiogenesII on 22/04/2022 20:42:31

DC31k22/04/2022 20:49:57
732 forum posts
2 photos
Posted by Howard Lewis on 22/04/2022 20:32:11:

As for chopping the end off the shank of a couple of 7/32" drills, the shanks won't be so short that they could not be used, would they?

No, but they will neither be hardened nor will they be 7/32" diameter.

Mike Poole22/04/2022 21:20:24
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Moderator
3383 forum posts
77 photos

The Marlco knurler used 7/32 pins and I used hardened silver steel to replace the ones on mine, it has worked fine so far but I am not an industrial user. The shank of a drill is likely to be undersize as there is a very slight reduction in diameter from the tip of a drill. The pins are a friction fit in the body of the Marlco and this is probably the critical part of the pin size, the knurl is only going to run on one side of the pin so a good fit is probably not too important.

Mike

B Tulley22/04/2022 21:26:31
39 forum posts
8 photos
Posted by DiogenesII on 22/04/2022 20:42:02:

Rotagrip might be worth a call - I know he carries knurls, I've seen 5/8 x 3/16 listed in his Ebay store which I think are 'when he has them, he has them', I think 5/8 x1/4 is a standard industry 'stock' size, as is (I think) 1/2 x 3/16 is; mine are this size.

I've always had found it easier to obtain a passable result with 3/16 wide wheels in my small lathe.

As others have said, I've used (and still have fitted) silver steel pins - nominal dia., cut to length and hardened as is.

Edited By DiogenesII on 22/04/2022 20:42:31

Many thanks for the Rotagrip suggestion - they have numerous sizes including 5/8" dia x 1/4" thick & 1/4" bore, which would be fine I think.

One question - what number of teeth do others generally use - Rotagrip have a fair selection: 68, 74, 88, 92 and 120 Teeth. Of course I have no idea what diameter I'll be knurling, but as it's on a Taig it'll most likely be smaller diameters.

Andrew Johnston22/04/2022 21:27:31
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6679 forum posts
701 photos
Posted by B Tulley on 22/04/2022 20:24:06

...two drills and then scrapping them for the shanks seemed an awful waste...

You don't buy drills just for the shank. Drill blanks are available:

Drill Blanks

With quality drills the shank is usually a thou or so smaller than nominal diameter, so drill blanks are better.

Andrew

B Tulley22/04/2022 21:28:29
39 forum posts
8 photos
Posted by DC31k on 22/04/2022 20:49:57:
Posted by Howard Lewis on 22/04/2022 20:32:11:

As for chopping the end off the shank of a couple of 7/32" drills, the shanks won't be so short that they could not be used, would they?

No, but they will neither be hardened nor will they be 7/32" diameter.

presumably those issues wouldn't apply to drill blanks - or would they? I do like the s/steel option though.

Martin Kyte22/04/2022 22:14:38
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2801 forum posts
53 photos

If you use silver steel and harden ,just be aware that the diameter will get bigger. Some reduction will be found on tempering but don't just assume that the pins will remain the same size.

regards Martin

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