This is my current plan for the frame:
- 12’ 8020 Beam for the header (reduces deflection, able to adder roller to guide cables)
what dimension beam are you looking at using? unistrut is 40mm and it seems to
flex a bit, if you are using 80mmx20mm that may or may not be rigid enough.
- Unitstrut rails to make up the rest of the frame (1/2 Height slotted hole)
- Ability to adjust distance between motors (Accuracy tuning)
as others have noted, no need to move the motors, just change the setting in
- Ability to adjust distance between work plane and motors (acommodate different material thicknesses to keep the chain planar)
- 3D Printed chain guides to keep chains engaged on gears, and to lock in place when not in use
I don’t think this is needed if you have the motors at the right distance so
that the chains are parallel (both sled side and slack side)
For the sled:
- Connect shop-vac hose to reduce sawdust
note that a shop-vac is about the noisiest option for dust collection (likely to
be as loud or louder than the router), and you want to make sure the hose isn’t
pulling on the sled (or preventing the sled from going all the way down)
- Using Siemens NX 11 to create P-Code
- Need to ensure linear coding is used not parametric
I am using the 80/20 fractional 15 series beam so it is 1.5” x 1.5”. The website has a handy deflection analysis tool which shows deflections well under 0.100”. As for the Unistrut I was looking at Superstrut which is carried at most home improvement retailers and it comes in 1 5/8” x 1 5/8” (which is the 40 mm standard). If I went that route I would be putting cross members in. I am open to other suggestions as well.
One problem you may have with that softare is getting it to create primitive
enough g-code for the maslow. you will have to look at it’s settings to see if
you can tell it to make g-code for grbl or what it’s config is to define what
g-code a machine understands.
I have to find the post but I remember someone bringing this up in regards to NX 12. The main thing is to try to figure out how to get it to generate linear curves instead of parametric. I will dig around into it a bit more.
I saw that and I can tell you that there must be a lot of assumptions behind that number, which I have not seen. My experience is that it twists and bends very easily if not very well supported along the length of the strut.
Yeah the main thing I will need to do is replicate fixed supports using angle brackets. I think I am also going to be using three vertical members along the span instead of two and/or some diagonals to give it more stability. Thankfully I am a structural engineer so it should be pretty straight forward (once I get time to sit down and do it haha)