What Material Do You Use?
Posted by carpenma
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Re: What Material Do You Use? October 08, 2008 12:06AM |
Demented Chihuahua Wrote:
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> I print ABS and HDPE. I don't mill anything as any
> respectable 'strap doesn't mill...hehe. ;-)
>
Which is why I mill and which is why I'll eventually EDM, too. >
<
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> I print ABS and HDPE. I don't mill anything as any
> respectable 'strap doesn't mill...hehe. ;-)
>
Which is why I mill and which is why I'll eventually EDM, too. >
<
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Re: What Material Do You Use? October 10, 2008 12:35PM |
vik_on_asus Wrote:
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> The polymorph is still used for making belt gears
> in a reprapped copy. We can'tquitemake
> gearsfineenough to do the X and Y axes,though I'm
> sure that'll change.
>
I'm pretty sure I can. If the features are large enough to have room for a 1/16th inch (1.59 mm) diameter cutter head, we're good to go.
I also expect that Nop can extrude them, too, from what I saw of his last effort in that direction.
He's getting features with well under 1 mm scale using 0.3 mm extruded filament (the gear on your right was made with a 0.3 mm filament).
Edited 4 time(s). Last edit at 10/10/2008 12:46PM by Forrest Higgs.
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> The polymorph is still used for making belt gears
> in a reprapped copy. We can'tquitemake
> gearsfineenough to do the X and Y axes,though I'm
> sure that'll change.
>
I'm pretty sure I can. If the features are large enough to have room for a 1/16th inch (1.59 mm) diameter cutter head, we're good to go.
I also expect that Nop can extrude them, too, from what I saw of his last effort in that direction.
He's getting features with well under 1 mm scale using 0.3 mm extruded filament (the gear on your right was made with a 0.3 mm filament).
Edited 4 time(s). Last edit at 10/10/2008 12:46PM by Forrest Higgs.
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Re: What Material Do You Use? October 10, 2008 01:24PM |
I don't know if we are quite there yet, or will ever be with FFF.
These parts have a direct effect on accuracy, so I think we need the teeth to be spaced correctly to within 0.1mm and the radius correct to 1/3 of that.
The steppers, belts and the gears are the few parts I think it is worth spending money on to get an accurate machine.
[www.hydraraptor.blogspot.com]
These parts have a direct effect on accuracy, so I think we need the teeth to be spaced correctly to within 0.1mm and the radius correct to 1/3 of that.
The steppers, belts and the gears are the few parts I think it is worth spending money on to get an accurate machine.
[www.hydraraptor.blogspot.com]
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Re: What Material Do You Use? October 10, 2008 02:14PM |
Oh well...
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Re: What Material Do You Use? October 10, 2008 03:03PM |
Demented Chihuahua Wrote:
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> Can't we just use closed loop control so that we
> have feedback about where we are to compensate for
> less than perfect parts?
>
Sounds great! Do it!
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> Can't we just use closed loop control so that we
> have feedback about where we are to compensate for
> less than perfect parts?
>
Sounds great! Do it!
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Re: What Material Do You Use? October 10, 2008 03:29PM |
Adrian calls things we can't replicate "vitamins". The point is to reduce the cost and mass of vitamins as much as possible. Are we doing that? Darwin has some big mother steppers that will be VERY hard to replicate. The belts and gears are appearing to be difficult to replicate, too. 
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Re: What Material Do You Use? October 10, 2008 04:08PM |
It is always good to bring to cost down as long as it doesn't reduce the performance and reliability or increase the effort or skill required to make it.
The steppers are only $30 each and I Vik is trialling smaller ones which should be cheaper.
I personally don't see the point of replicating things I can buy for a reasonable price, especially if the bought ones are better than I can make.
I make the judgement roughly by how long it would take me to make one multiplied by how much I get paid per hour compared to the price, YMMV
[www.hydraraptor.blogspot.com]
The steppers are only $30 each and I Vik is trialling smaller ones which should be cheaper.
I personally don't see the point of replicating things I can buy for a reasonable price, especially if the bought ones are better than I can make.
I make the judgement roughly by how long it would take me to make one multiplied by how much I get paid per hour compared to the price, YMMV
[www.hydraraptor.blogspot.com]
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Re: What Material Do You Use? October 10, 2008 04:15PM |
> Vik is trialling smaller ones which should be cheaper.
I don't think he is going to find those Lin Engineering steppers that I sent along to him years ago particularly cheap.
I got 'em in as salvage from a production line that was shut down before all the feedstock was used.
I still think the ones that CW-Motor makes are the best bet, though. They only draw 400 mw, which means you can go to a cheap 754410 half-H controller chip. I noticed that Jameco imports CW-Motor steppers. I'm going to see what they'd charge for a special order.
> I make the judgement roughly by how long it would take me to make one
> multiplied by how much I get paid per hour compared to the price, YMMV
>
You do that, too, do you. Mind, I tend to figure on what the hourly wage of my target audience is. When you're 12 or so, hourly wages aren't particularly high. Patience, however, is typically in very short supply, in my experience.
I don't think he is going to find those Lin Engineering steppers that I sent along to him years ago particularly cheap.
I got 'em in as salvage from a production line that was shut down before all the feedstock was used.I still think the ones that CW-Motor makes are the best bet, though. They only draw 400 mw, which means you can go to a cheap 754410 half-H controller chip. I noticed that Jameco imports CW-Motor steppers. I'm going to see what they'd charge for a special order.
> I make the judgement roughly by how long it would take me to make one
> multiplied by how much I get paid per hour compared to the price, YMMV
>
You do that, too, do you. Mind, I tend to figure on what the hourly wage of my target audience is. When you're 12 or so, hourly wages aren't particularly high. Patience, however, is typically in very short supply, in my experience.
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Re: What Material Do You Use? October 10, 2008 05:44PM |
Forrest Higgs Wrote:
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>
> I noticed that Jameco imports
> CW-Motor steppers. I'm going to see what they'd
> charge for a special order.
>
Ridiculous bastards. They won't special order for less than 500 units.
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>
> I noticed that Jameco imports
> CW-Motor steppers. I'm going to see what they'd
> charge for a special order.
>
Ridiculous bastards. They won't special order for less than 500 units.
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Re: What Material Do You Use? October 15, 2008 07:07PM |
Inspired by nophead's successes I tried making a belt pulley based on the BitsFromBytes acrylic designs. Material is ABS, 0.5mm at 16mm/s.
After a few false starts this is how it turned out:
wrapping the belt ...
It is not perfect but I think it would be functional. I have attached the stl file if anyone else would like to have a go
Peter
After a few false starts this is how it turned out:
wrapping the belt ...
It is not perfect but I think it would be functional. I have attached the stl file if anyone else would like to have a go
Peter
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Re: What Material Do You Use? October 16, 2008 09:53AM |
Wowzie! That's brilliant!
If he can make the sprocket, he ought to be able to make the belt, too. I wonder how ABS would stand up to flexing?
That's brilliant! If he can make the sprocket, he ought to be able to make the belt, too. I wonder how ABS would stand up to flexing?
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