Richard.
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At the most.don't hold your breathone or 2 might
- Thread starter Gizmo.Y
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Richard.
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- Cambridgeshire
I'm sure you did and I'm sure whoever makes them for you dose a great job.
Rolling a cone is not a difficult job once you've got things mapped out to the right shape. Then it's a case of back and forth through the slip rolls in an arc till the ends meet. So you really need not worry about them from a quality POV. Any sheet metal worker worth there salt can make your simple design. The only draw back as I've mentioned before is your gage tends to lean towards bigger rollers dealing with bigger diameters. Not impossible but it is out of the scope for a lot of smaller rollers. Wait to see what your replies come back as but as brightspark rightly says if your waiting on 5 expect to maybe hear back from 1 or 2 at the most.
Rolling a cone is not a difficult job once you've got things mapped out to the right shape. Then it's a case of back and forth through the slip rolls in an arc till the ends meet. So you really need not worry about them from a quality POV. Any sheet metal worker worth there salt can make your simple design. The only draw back as I've mentioned before is your gage tends to lean towards bigger rollers dealing with bigger diameters. Not impossible but it is out of the scope for a lot of smaller rollers. Wait to see what your replies come back as but as brightspark rightly says if your waiting on 5 expect to maybe hear back from 1 or 2 at the most.
Paul G
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I can't believe that you lot think £29.60 is expensive. I would jump at that, even though I have a set of 500 x 40mm rolls that would roll them.
Buy a sheet of 304 / 316, cut them out, roll, tack, weld presumably TIG with backing gas, clean, pack, arrange a courier, (which will cost little more than shipping from USA)
write, print and send an invoice, all for 5 off ?
To the OP, copy these and then you can make your own.
Paul G
Buy a sheet of 304 / 316, cut them out, roll, tack, weld presumably TIG with backing gas, clean, pack, arrange a courier, (which will cost little more than shipping from USA)
write, print and send an invoice, all for 5 off ?
To the OP, copy these and then you can make your own.
Paul G
Richard.
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- Cambridgeshire
Would those happily roll 1.6mm stainless Paul?
Did you make them yourself? Nice job mate.
I need these to be Mint and Ripple Free, this isnt for some home made project - this is for a line of exhausts im planning to develop and sell.
Its quite common to see in the motorcycle markets, its just finding that one place that does what i need.
hopefully a couple of these "feelers" get back to me today with prices.
Its quite common to see in the motorcycle markets, its just finding that one place that does what i need.
hopefully a couple of these "feelers" get back to me today with prices.
Paul G
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The 40mm rollers started life as ram shafts so tough material, and yes, 16g stainless.
Doesn't show in that photo but they're pyramid rolls, which always roll thicker material than initial pinch.
The bottom two rolls are linked with an idler cog so they revolve the same way, all three are change wheel
cogs from a Harrison lathe.
The rest is 50mm box and 12mm plate.
Can do end pics if you fancy making a set.
Paul G
Richard.
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Nicely done Paul. Yeah that would be great to see some nice all round shots of those.The 40mm rollers started life as ram shafts so tough material, and yes, 16g stainless.
Doesn't show in that photo but they're pyramid rolls, which always roll thicker material than initial pinch.
The bottom two rolls are linked with an idler cog so they revolve the same way, all three are change wheel
cogs from a Harrison lathe.
The rest is 50mm box and 12mm plate.
Can do end pics if you fancy making a set.
Paul G
Nice to see a hefty set but still get down to those small rads. The old saying goes if you want it right make it yourself
Paul G
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Richard.
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If they are done on a smooth set they won't have imperfections. The key to a cone as I've made many is to have an accurate shape cut out so that when the ends finally marry up they touch all the way across giving you your two diameters and have flat faces. You've got to roll it in an arc following the two curves of the pre cut sheet. So they must start with the rollers parallel to the first edge and finish with the rollers parallel to the exit edge. Back and forth applying a little pressure each time till the ends meet. This is effectively letting the sheet slip on the smaller diameter. If you don't do this you'll end up with it been open at one end.
Don't be put off by thinking such things cannot be produced to the standard you want on home made equipment. Have you seen Paul's work that he does at home along with many others here. I'd have no problems asking him to produce a quality job if I wasn't equipped or capable of doing it myself.
Richard.
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Do you have the ability to cut out the cones from sheet giz. This could save you a lot of money if your handing pre cut sheets to just be rolled.
This would be the way to work out your cone shape.
I've done it in mm but it works however you want.
Once you work out the length from the datum point to the top of the cone your laughing and can draw up any size or shape you like.
This would be the way to work out your cone shape.
I've done it in mm but it works however you want.
Once you work out the length from the datum point to the top of the cone your laughing and can draw up any size or shape you like.
Paul G
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Just for you Richard.
The three holes are drilled in the end plates (bolted together and match drilled) then cut down to the edge of the top hole ether side
and save this piece to make the slide.
I drilled & tapped into the edge of the 12 plate for the clamp bars and also to fix to the box incase I need to take it apart.
Cheers
Paul G
Richard.
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Appreciate that paul. Very nice work gone into that.
Brad93
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Well id need a drawing mate
Paul G
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Thanks. I prefer to think of them as "practical" rather than aesthetic. Suppose I should have rounded those top corners.
"Ahem" years ago at the start of my apprenticeship I commented on an item my mentor had made.
He said, "Son, there aren't many of us old craftsmen left."
Paul G
Richard.
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I've just posted an easy way to produce a drawing giz. Do the calc and produce your drawing of the cone in flat form. It will then produce your product once rolled. If it's cut out right it will be the right dimensions when the two ends meet up.
