Author Topic: GF badge dimensions  (Read 285 times)

Offline Minto

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GF badge dimensions
« on: 27.07. 2020 19:02 »
Well, still can't find any badges for my 52 plunger tank, so I'm going to have a go at casting some in pewter this coming weekend. It would be way easier if I had a pair to take an imprint from but then, where's the challenge in that.
I've hunted around the internet for some dimensions but the only thing I've got so far is a measurement of the length of the badge being 4 7/8" long, with holes drilled 3 3/4" to centres.
I drew out the badge earlier but these measurements seem a little off. If someone could take a ruler to one and post up some vital statistics, that would help enormously. Length overall, diameter of the circle, hole centres, BSA font size etc.
Or if anyone has a pair they could loan me for an afternoon in exchange for a spare set of cast pewter ones (maybe to decorate a garage wall) that would be even more awesomer.
Any help appreciated.
Jase
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Offline muskrat

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Re: GF badge dimensions
« Reply #1 on: 27.07. 2020 20:22 »
G'day Minto.
Is your tank an A10 or the smaller A7 tank?
Cheers
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'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline Minto

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Re: GF badge dimensions
« Reply #2 on: 27.07. 2020 20:43 »
Hi Musky, it's a new Indian made larger A10 tank. The part number for the badge is 67 8070/1.
Like bloody hen's teeth!
Cheers
Jase
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Offline muskrat

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Re: GF badge dimensions
« Reply #3 on: 27.07. 2020 21:16 »
A quick search got this one.
Cheers
https://www.ebay.co.uk/itm/164303529044
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Online Greybeard

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Re: GF badge dimensions
« Reply #4 on: 27.07. 2020 23:22 »
I will measure mine tomorrow.

How would you go about creating the moulds?
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Offline Minto

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Re: GF badge dimensions
« Reply #5 on: 28.07. 2020 00:15 »
Hi Greybeard, much appreciated.
If I could find a pair of original badges it's just a case of imprinting into green sand, and casting straight from that, or imprinting into modelling clay, pouring plaster of Paris into that to form a pattern for the sand cast. Otherwise I'll carve some patterns from some modeling clay, bake it then either use a high temp silicon mould compound or just sand cast. I'll probably do a fair bit of experimenting to see what gives best results.
I'll take pics of what works and what doesn't as I do it
I love playing around with this sort of thing.
Jase
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Offline Minto

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Re: GF badge dimensions
« Reply #6 on: 28.07. 2020 00:17 »
Cheers Musky, don't know how I managed to miss that, I'll keep an eye on it, though they do seem to fetch silly money.
Jase
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Re: GF badge dimensions
« Reply #7 on: 28.07. 2020 09:59 »
Hi Greybeard, much appreciated.
If I could find a pair of original badges it's just a case of imprinting into green sand, and casting straight from that, or imprinting into modelling clay, pouring plaster of Paris into that to form a pattern for the sand cast. Otherwise I'll carve some patterns from some modeling clay, bake it then either use a high temp silicon mould compound or just sand cast. I'll probably do a fair bit of experimenting to see what gives best results.
I'll take pics of what works and what doesn't as I do it
I love playing around with this sort of thing.
Jase
As you can imagine I'm loath to send off my badges in case they get lost or damaged in the post. How about I get some plasticine and make impressions to send to you?
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Offline Minto

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Re: GF badge dimensions
« Reply #8 on: 28.07. 2020 12:10 »
Greybeard, massive thanks that would be totally brilliant, and I'm sure I'll be able to work from that.
Do you still have my address?
Jase
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Re: GF badge dimensions
« Reply #9 on: 28.07. 2020 13:45 »
Greybeard, massive thanks that would be totally brilliant, and I'm sure I'll be able to work from that.
Do you still have my address?
Jase
Yes, I'm sure I have your address in messages.
I'm going to send you a PM now.
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Offline muskrat

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Re: GF badge dimensions
« Reply #10 on: 28.07. 2020 20:18 »
G'day Minto.
You may have a market for them.
My grandfather was a pattern maker. I remember him telling me the pattern had to be a certain % bigger than the finished product depending on the material eg ?% for alloy, ?% for ci to allow for shrinkage when cooled.
I'm sure you already know this. Just for the info to others.
Best of luck with it.
Cheers
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Online Ted_Flash

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Re: GF badge dimensions
« Reply #11 on: 29.07. 2020 08:46 »
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Ted Wilkinson, Ramsbottom, Lancashire
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Offline BSA_54A10

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Re: GF badge dimensions
« Reply #12 on: 29.07. 2020 08:51 »
I will measure mine tomorrow.

How would you go about creating the moulds?

Easiest way is to use silicon moulding gel.
You can cast aluminium into most of them or get the cheaper stuff for white metals
Only trick is mixing the gel on a flat class surface so you do not entrap  air
and if you have a brake bleeder, degassing the solution
Then place the original face up on some glass, put a baked beans can with neither top or bottom over it and pouring the moulding gel over the top very slowly to avoid trapping air.
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Re: GF badge dimensions
« Reply #13 on: 29.07. 2020 09:10 »
See Lot 9:

https://www.a7a10.net/forum/index.php?topic=14889.0
Clever idea to make a universal mould and remove the unwanted wings on either side.
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Offline Minto

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Re: GF badge dimensions
« Reply #14 on: 29.07. 2020 10:07 »
Hi Ted, if you still have this lot I'll definitely relieve you of lot 9, that's going to save me loads of time.
I'll try to pm you.
Cheers
Jase
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