best material for the bed to cover honeycomb

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Jason Wright
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best material for the bed to cover honeycomb

Post by Jason Wright » Tue Nov 29, 2016 1:50 pm

Im going to make a pin bed but ill obviously need to cover the honeycomb bed. so what would be the best plain material to use, i can think of 4 options

1, 2mm steel
2, 3mm aluminium
3, acrylic - maybe 5mm?
4, MDF - say 12mm

something thats flat and stable


cheers
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Keith Sherwin
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Re: best material for the bed to cover honeycomb

Post by Keith Sherwin » Tue Nov 29, 2016 2:05 pm

Do NOT use MDF!
Something like steel or aluminum with Acrylic on top of that to space the pins. Can't remember if aluminum or steel is the preferred material.
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Jason Wright
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Re: best material for the bed to cover honeycomb

Post by Jason Wright » Tue Nov 29, 2016 2:08 pm

ok thanks, thought the ali might not be preferred over he steel as it reflects more, but i could paint it and it will be lighter, just didnt want to put too much weight on the bed, and i wouldnt use anything less than 2mm steel as it can bend so defeats the object of levelling my bed tomorrow
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RD works V8.01.18 windows 10

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Gene Uselman
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Re: best material for the bed to cover honeycomb

Post by Gene Uselman » Tue Nov 29, 2016 2:22 pm

The problem with a pin bed is getting enough height, unless the pins are embedded in metal you will have fires. I am currently using a 1/8x12x24 pc of pierced steel from amazon with 2" roll pins, which works pretty well. Russ had acrylic but he has less power on this original machine, so less excess energy into the base. I plan to make a .25 alum plate on my cnc with holes arranged in alternating rows so the pins are approx 1.5" apart and with larger holes in the spaces for smoke/fumes to escape to the bottom. Steel is less reflective than alum BTW. Something like below- the red circle is approx 1.5" for spacing- also it is convenient to have at least a small area with closer spaced pins for smaller parts. Gene
pin board.jpg
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Re: best material for the bed to cover honeycomb

Post by Willy Ivy » Tue Nov 29, 2016 2:38 pm

Definitely DO NOT use MDF or plywood. See my Be Careful post in modifications to see what happened to my first laser.
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Jason Wright
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Re: best material for the bed to cover honeycomb

Post by Jason Wright » Tue Nov 29, 2016 2:46 pm

ive seen Russ's new design pin boards 8mm acrylic with 32mm dowel pins so there seems to be plenty of room under the work, ill definitely be making the actual pins boards from acrylic, im asking about the cover for the bed to sit them on
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RD works V8.01.18 windows 10

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Gene Uselman
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Re: best material for the bed to cover honeycomb

Post by Gene Uselman » Tue Nov 29, 2016 3:15 pm

I would then suggest steel as it is less reflective. I think with the power you have and 1.25" pins you will be really melting the acrylic if not burning it.

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Re: best material for the bed to cover honeycomb

Post by Jason Wright » Tue Nov 29, 2016 3:25 pm

maybe longer pins then, i can easily get hold of 50mm x 4mm pins and set them in the acrylic, i think if im still seriously effecting the acrylic 42mm below the job i need to look at the power im using maybe
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Dustin Hawkinson
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Re: best material for the bed to cover honeycomb

Post by Dustin Hawkinson » Wed Nov 30, 2016 12:14 am

I use mild steel that is about ~1.6mm thick (16 guage? I forget). It is not too heavy but rigid enough not to worry about bending. I tested a little when I first put it in over my aluminum bed and it is far less reflective than the aluminum.

I have a piece of 22 gauge mild steel (~0.75mm) that I tried to use at first, but it was too flexible. My bed is only 300x500 so on your larger bed you could go 2mm thick if you were worried about flex.
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Simon Morris
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Re: best material for the bed to cover honeycomb

Post by Simon Morris » Wed Nov 30, 2016 4:11 am

I'm using "fireboard", which is a kind of cement-bound chipboard.

It saws quite easily, and is totally incombustable.
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