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Author Topic: Gemmasta 4/5 belt repair or replacement  (Read 151 times)

daw1zard

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Gemmasta 4/5 belt repair or replacement
« on: August 20, 2019, 05:46:12 PM »
Hi ALl,


for those with a gemmasta. Is it possible to repair a broken belt i.e with glue or some sort of adhesive, or better to just get a new one (if I can)?


Mine just broke mid stone :(


Thanks
Troy

MakkyBrown

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Re: Gemmasta 4/5 belt repair or replacement
« Reply #1 on: August 20, 2019, 05:54:26 PM »
If it one of the plastic belts. Melt and stick together, there are various techniques. Some use a heated blade held in a vice and push the belt on from each side and slide together.  I've joined it on the machine but heating the two end till melty with a blow torch and quickly pushing together.  After pushing together and cooled cut of excess with sharp knife.
Heaps of info on youtubehttps://www.youtube.com/results?search_query=joining+poly+belt
CheersMB

daw1zard

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Re: Gemmasta 4/5 belt repair or replacement
« Reply #2 on: August 20, 2019, 06:14:40 PM »
If it one of the plastic belts. Melt and stick together, there are various techniques. Some use a heated blade held in a vice and push the belt on from each side and slide together.  I've joined it on the machine but heating the two end till melty with a blow torch and quickly pushing together.  After pushing together and cooled cut of excess with sharp knife.
Heaps of info on youtubehttps://www.youtube.com/results?search_query=joining+poly+belt
CheersMB



Thanks for that. Couldn't be any easier. Ill give that a go now. I may just order a spare anyways but this will get me going again.

Troy

Rusted

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Re: Gemmasta 4/5 belt repair or replacement
« Reply #3 on: August 20, 2019, 06:25:50 PM »
Go to your local bearing supply place and buy a length of Urethane belting, it's usually round and hollow, 3/16 or quarter is the diameter you want. Usually the orange, though green will do.
They will probably try to sell you a little barbed joiner give it a miss, they tend to make a knock every time the joiner goes around.

To join the belt is easy, join it in position so you don't need to dismantle any of your machine. Feed it around your pulleys and mark where you need to cut it, keep it a little tight. then slip it off the pulleys so you can have the ends accessible. Cut the ends nice and square with a razor blade.

This is where you are going to need a spare pair of hands.
Get an old kitchen knife with a long blade so your helper can hold it without getting in the way, heat a small area of the blade hot enough to melt the plastic belt. Hold the flame in one position so you don't get soot on all the blade, next bring your belt in to a non sooty spot and just lightly hold the ends on either side of the hot blade for a couple of seconds, you will see the urethane melt, slide the belt ends off the blade and quickly bring them together nicely lined up. Don't push the ends together hard or you will squeeze the molten urethane out and have a weak join. In a second or two you will have a join that is as strong as the belt, you can cut the excess bulge off if you like but I find it doesn't knock or bump at all and probably gives a stronger join if left on.


daw1zard

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Re: Gemmasta 4/5 belt repair or replacement
« Reply #4 on: August 20, 2019, 06:28:51 PM »
All Done, thanks guys and thanks for the suggestion Rusted. Ill try to get a length for spares. My machine has the belt underneath so easy to get on and off.

Back up and running now. :)

Troy

MakkyBrown

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Re: Gemmasta 4/5 belt repair or replacement
« Reply #5 on: August 20, 2019, 07:05:47 PM »
I got a few meters of the green belt from ebay, was awhile back, might of cost about $10.

CheersMB

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