I'm thinking 3/4" too 1" would work, mind you their is no up and down forces and no real weight on the gantry from the head.
I need to know what the dia of a un-supported shaft needs to be for a span of 48" These shafts will be supporting my gantry for a laser cnc machine design. I really don't what to use a support shaft if I don't have to.
I'd like to use somthing like this-
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Thank You,
Paul G
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I'm thinking 3/4" too 1" would work, mind you their is no up and down forces and no real weight on the gantry from the head.
Thank You,
Paul G
Check out-
[URL="http://www.signs101.com"]www.signs101.com[/URL]
Here is my new laser-
Thank You,
Paul G
Check out-
[URL="http://www.signs101.com"]www.signs101.com[/URL]
Yes, anything from 1/2inch up in diameter will work. You'll be using 2 of them.
Even 1" will sag a little at 4 ft, but it probably won't affect the cutting, I wouldn't think.
If you can double up the end mounting clamps, it gets quite a bit stiffer.
Gerry
UCCNC 2017 Screenset
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Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
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Where can I find this, I have looked un and down the internet
Thank You,
Paul G
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[URL="http://www.signs101.com"]www.signs101.com[/URL]
Well darn...did some calculations...here they are for Thomson 60 shafts.
Unsupported Length = 48 inches
Weight of Load = 100 lbs
Deflection at the center of the unsupported length (24 inches) is:
1/2 inch dia. shaft ~= 2.493 inches
5/8 inch dia. shaft ~= 1.00 inches
3/4 inch dia. shaft ~= 0.49 inches
1 inch dia. shaft ~= 0.1536 inches
For a load of 10 lbs the deflection for the 1/2 inch shaft is 0.2493 inches. You can guess what the others are.
Paul
If you want to use the T-rail then you should buy shafting that is pre-drilled. Thompson has it....anyone that sells shafting has T-rail.....the one you picture looks like a home made one...but I'm not for certain.Originally Posted by CNCadmin
CNCAdmin
interesting project. Keep us up to date on how it goes.
How much load do these rails have to support?
The linear rails in post #6 are Igus Drylin S supported shaft part AWUM - metric only. They're hard anodized Aluminum for open plastic bearings only.
Pacific bearing do something similar too..
thank you this is what I was looking for- http://igus.bdol.com/drylins.asp
Thank You,
Paul G
Check out-
[URL="http://www.signs101.com"]www.signs101.com[/URL]
cool laser, is that the co2 set-up from amazing-1?
No, I got it from a ebay seller, It's a RF co2 laser.
Thank You,
Paul G
Check out-
[URL="http://www.signs101.com"]www.signs101.com[/URL]