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 Post subject: Grinding pewter
PostPosted: Sun Dec 13, 2015 7:17 pm 
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This is a question for a friend rather than me but hopefully someone on here may be able to help.
My friend is building up a small pewter casting business , it's grown largely from a display he was doing via the re-enactments we do and he has now supplied a couple of craft centres.
His " problem" is that some of his castings sometimes need a little bit of cleaning up to remove sprues etc which he can do with a sharp knife and file but that can be time consuming if he's making a large run. Currently he has a bench grinder fitted with a fairly standard carborundum stone used before the casting moves on to a polisher. However , the stone soon clogs up with the soft metal. My own thoughts are that some sort of lubricated wheel may solve the clogging problem unless anyone with a bit more knowledge knows of a more suitable stone . I did wonder about some sort of linisher but again think that too may suffer from clogging.
Any ideas gratefully received.


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 Post subject: Re: Grinding pewter
PostPosted: Sun Dec 13, 2015 8:07 pm 
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Difficult one...
Does it have to be on a bench grinder?

I was going to suggest a 4.5 or 5" grinder, with fibre discs, cheap and cheerful to throw away when clogged.

This sort of thing-
http://catalogue.3m.co.uk/en_gb/gb-asd/ ... _Disc~985C

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 Post subject: Re: Grinding pewter
PostPosted: Sun Dec 13, 2015 9:40 pm 
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No it's not really a case of bench grinder or nothing else. The only really deciding factor is that the grinding "tool" is in a fixed position or rather fixed to a bench. The items he needs to grind are quite small , many are key ring fobs , and he will have a pile which go to the grinder then straight on to the polisher pretty much without it leaving his hand.


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 Post subject: Re: Grinding pewter
PostPosted: Sun Dec 13, 2015 10:09 pm 
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For a soft material like pewter a file is really the best tool. A coarse sanding/linishing belt will do a good job though and is not difficult to clean.



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 Post subject: Re: Grinding pewter
PostPosted: Sun Dec 13, 2015 10:44 pm 
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Ha ha , I have said to him that a file would be the best tool largely because it means he can more easily save all the filings and return them to the pot but he's probably thinking of a speedier approach for when he hits the "big time" , plus as he says " nah a files too much like hard work and I'm lazy and impatient " .


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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 8:12 am 
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Grendel wrote:
Ha ha , I have said to him that a file would be the best tool largely because it means he can more easily save all the filings and return them to the pot but he's probably thinking of a speedier approach for when he hits the "big time" , plus as he says " nah a files too much like hard work and I'm lazy and impatient " .


The amount of shavings saved vs the cost of pewter means that wouldn't be much a of a saving. A file though is an efficient tools on soft materials and hard to overwork. He will probably be best suited with a linisher, slow speed.


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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 10:10 am 
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Would a Dremel type tool be any good? See http://www.tool-shop.co.uk/Dremel/Acces ... raq12o8cb6

DWD



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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 10:24 am 
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dewaltdisney wrote:
Would a Dremel type tool be any good?


I think with the right tool in the end it would be ideal: I do know a lot of ceramicists use them for their more delicate clean-up work.

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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 12:15 pm 
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Hi,

Tumbling machine? :scratch:

Kind regards, Col.

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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 6:18 pm 
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Rorschach wrote:
Grendel wrote:
Ha ha , I have said to him that a file would be the best tool largely because it means he can more easily save all the filings and return them to the pot but he's probably thinking of a speedier approach for when he hits the "big time" , plus as he says " nah a files too much like hard work and I'm lazy and impatient " .


The amount of shavings saved vs the cost of pewter means that wouldn't be much a of a saving. A file though is an efficient tools on soft materials and hard to overwork. He will probably be best suited with a linisher, slow speed.


To be fair he has improved , some of his earlier efforts had quite a large amount of flash to be taken off which commonly ended up in the grass. I'm a tight wad and hate waste which is why I mentioned about saving the filings. I did find a quote on the 'tinterweb that said pewter was something like the fourth most precious metal although frankly despite how much it costs we don't believe that .
.It does depend on the casting , some designs have little to clean off but others do require a bit more . I'll mention the linisher to him. Looking at it another way , does anyone have any recommendations for cleaning the grinding wheels or linisher belts?


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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 6:21 pm 
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dewaltdisney wrote:
Would a Dremel type tool be any good? See http://www.tool-shop.co.uk/Dremel/Acces ... raq12o8cb6

DWD

He has tried a dremel and although it worked the grinding bits didn't have anywhere near the lifespan to make it economical , but thanks anyway.


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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 6:24 pm 
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Retired wrote:
Hi,

Tumbling machine? :scratch:

Kind regards, Col.


Probably would be good for the final polish , probably better than the wheel he uses now . We may have to rig one up just to try as I have a large bag of what seems to be clay balls that was used in a tumbler to polish resin statues lying around.


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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 6:43 pm 
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Hi,

I can highly recommend one of these blocks for cleaning abrasive belts. My chum David kindly bought me one as a prezzie a few years ago and I wouldn't now be without it. It cleans my abrasive belts like magic. :thumbleft:

http://www.screwfix.com/p/titan-abrasive-belt-cleaner-76mm/16210

For my grindstones on the bench grinder I use an industrial diamond but if used frequently as it would need to be whilst grinding a soft metal the wheel life would be drastically reduced?

Kind regards, Col.

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 Post subject: Re: Grinding pewter
PostPosted: Mon Dec 14, 2015 9:30 pm 
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Retired wrote:
Hi,

I can highly recommend one of these blocks for cleaning abrasive belts. My chum David kindly bought me one as a prezzie a few years ago and I wouldn't now be without it. It cleans my abrasive belts like magic. :thumbleft:

http://www.screwfix.com/p/titan-abrasive-belt-cleaner-76mm/16210

For my grindstones on the bench grinder I use an industrial diamond but if used frequently as it would need to be whilst grinding a soft metal the wheel life would be drastically reduced?

Kind regards, Col.



Oh yes those crepe blocks are superb. In a pinch though you can use cured silicone from an old tube.


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 Post subject: Re: Grinding pewter
PostPosted: Tue Dec 15, 2015 8:34 am 
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That's interesting Rorschach and something I didn't know. My friend does use a two part compound for making moulds that cures into what is in effect silicone rubber . Maybe he can use an old mould for cleaning his wheel , many thanks.


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