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Number stamps quality.

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Andrew Tinsley27/02/2022 13:24:00
1630 forum posts

I need to stamp the numbers on some dials that I have engraved. The sets of number stamps that I have (No name on them) are very poor at getting each number in the same place! Even the individual numbers are not upright and vary in degree of list!

So can anyone recommend a set of number stamps that always put the number in a standard place? I would be looking for 2 or 3 mm size height.for thr numbers.

Thanks,

Andrew.

Thor 🇳🇴27/02/2022 13:55:46
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1632 forum posts
46 photos

Have a look at Arc's.

Thor

Andrew Tinsley27/02/2022 14:10:38
1630 forum posts

Thanks Thor,

The sets I have, are from well known sources and I am surprised how poor they are. Have you actually tried Arc's offering and were they accurate? I don't want to buy yet another set that are dodgy! So can anyone recommend a set from experience, that give good results?

Regards,

Andrew.

Adrian Downes27/02/2022 14:43:03
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35 forum posts
15 photos

Can you not engrave or have them engraved for you?

ega27/02/2022 14:48:59
2543 forum posts
201 photos

Most of mine are by JHS MODELMARK and are pretty good.

It helps to use something like GHT's UPT jig which would allow a faulty stamp to be rotated about its axis.

That said, I am sure that folk with plenty of practice can achieve good results by hand and eye.

Nicholas Farr27/02/2022 14:57:52
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3361 forum posts
1543 photos

Hi Andrew, these letter and number ones are from ARC.

letters & numbers.jpg

I do have these 2mm and 1mm number ones badge GROZ, but can't remember who I bought them from, but it would have been one of the well known traders at one of the ME exhibitions.

numbers.jpg

They have all stamped OK.

Regards Nick.

Edited By Nicholas Farr on 27/02/2022 14:58:58

Andrew Tinsley27/02/2022 15:17:29
1630 forum posts

Thanks Nick.

It looks as though the Arc set are better than the ones I have. I use a tool based on a Tapping jig and can hold the square section of the punch very accurately. However this is no good if the punches are not accurate!

I will take a look at JHS modelmark's offering too. Thanks for that ega.

Engraving sounds even worse than punching and I certainly won't pay for a professional to do it. We are supposed to be model engineers after all.

Thanks everyone,

Andrew.

Mike Poole27/02/2022 15:22:27
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Moderator
3344 forum posts
74 photos

Pryor were a big name in number letter and number stamps. I am not sure whether they are still in business.

Mike

It looks like they are still around Pryor

Edited By Mike Poole on 27/02/2022 15:25:01

Ian Couchman27/02/2022 15:24:57
4 forum posts
2 photos

img_5506.jpgimg_5504.jpg

I got these Kennedy stamps from Zoro. Very pleased with them.

https://www.zoro.co.uk/shop/hand-tools/letter-and-number-stamps/hand-stamps-sets/f/13378?query=letter+stamps

Ian

Edited By Ian Couchman on 27/02/2022 15:26:00

Dave Wootton27/02/2022 16:20:59
306 forum posts
65 photos

I've got some sets of Pryor letter and number stamps some quite old, none of them can be relied on when using any sort of jig for stamping. I did some feed dials using a GHT pillartool and had to use shims glued on to the stamps to get them to line up nicely, Likewise when using a straightedge to try and get a nice straight line of stampings. GHT mentions this problem in his write up on the pillartool, so it's not only the cheapies that are a bit out of register.

Dave

Clive Brown 127/02/2022 17:09:44
828 forum posts
42 photos

Arnold Throp was a senior man at Pryor in Sheffield. His stamping ground so to speak.smiley

bernard towers27/02/2022 17:11:55
619 forum posts
109 photos

I bought a set of 1 mm from Pryor a couple of years ago as they assured me that the characters were absolutely central and they are, worth the extra few quid.

Nick Hughes27/02/2022 17:19:33
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264 forum posts
144 photos

This is the type you need for accuracy, but you will probably need to make a holder :- **LINK**

Andrew Tinsley27/02/2022 20:44:38
1630 forum posts

Thanks everyone,

I have just ordered the precision W/O Pryor number stamps.

Regards,

Andrew.

old mart27/02/2022 21:04:15
3775 forum posts
233 photos

_igp2449.jpgWhen I made a special cross slide dial for the Smart & Brown imperial lathe so that a metric leadscrew could be used, (118 divisions is close to 3mm pitch), a jig was made to help hold the punches square to the dial when stamping it. Because I can never hold them straight freehand.

_igp2446.jpg

Derek Lane27/02/2022 21:56:01
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762 forum posts
171 photos

For those that want to hold stamps inline.

Nigel Graham 227/02/2022 22:09:41
2140 forum posts
29 photos

Faced with that problem on my Hemingway Kits T&C Grinder table, I elected not to make the little jig suggested but to use one my old, "widows and orphans " , Vee-blocks as a guide, and obtained satisfactory results. It just needed a lot of care to align the tools at each graduation.

However, stamping widely-spaced pairs of digits is not the same as stamping longer numbers or words, where engraving would be the far better method. (I do of course mean machine-engraving, not freehand with a vibrating-stylus tool.).

Jon Lawes28/02/2022 00:54:48
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927 forum posts

No matter how slow and careful I try to be mine always end up looking like a randsom note.

Bill Phinn28/02/2022 02:30:07
755 forum posts
113 photos
Posted by Nigel Graham 2 on 27/02/2022 22:09:41:

stamping widely-spaced pairs of digits is not the same as stamping longer numbers or words, where engraving would be the far better method.

If the part you're stamping is flat and you can hold it in your milling vice, preferably some way below the top of the jaws, there's really no need for a jig at all in order to stamp strings of characters uniformly; you just need to use a threaded vice stop with some means of counting the number of turns of the screw (e.g. a hex head!) as you advance it for the next letter. You can even do multiple lines of text this way with just a bit of thought.

If you work with care, the only thing under these circumstances that will produce unevenly spaced stamping is if any of the characters aren't cut perfectly centrally on the shank of the punch.

My experience of six different brands of stamp tells me that buying even the most respected brand doesn't guarantee all the characters in the set will be centrally cut on the punch. Accordingly, in order to ensure you get evenly spaced and uniform stamping you need to be prepared to compensate for this manufacturing inaccuracy where necessary.

I've not tried characters on moveable-type-like bodies of the kind in Nick Hughes' link, so I couldn't say whether these are consistently cut more accurately than the punches; I'd hope so given the extra cost of them. And of course, as Nick suggests, you can't strike these directly with a hammer; they have to go in some kind of typeholder, made either for individual characters or for strings of them.

If you're using the latter kind of typeholder and you're marking a longish word on steel all in one hit you're going to have to be prepared to hit that typeholder very hard in order to get a good impression, particularly if you're using a biggish font size.

Gerhard Novak28/02/2022 10:17:49
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109 forum posts
114 photos

Great hint Derek

Think I have to make one of these jigs...

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