Concept Design for a new 6-axis router - take your best shot! - Page 3


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Thread: Concept Design for a new 6-axis router - take your best shot!

  1. #25
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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Actually, the tubes I was considering doing that to were the fixed beams that form the X axis, not the gantry. The idea was that they'd go inside the tube from one end on top to a bar fixed onto the bottom, and then to the other end, in a shallow "V" shape, with a second pair doing the same thing from bottom to top. Thinking about it some more, I was looking at fabricating some steel cables with threaded ends that would protrude through some angled end caps, so I could tension them with nuts. Using 4 of them, I was hoping I could control or remediate some of the twisting and sagging that hot-rolled tubing normally has. I was wondering, though, if this would induce weird harmonic vibrations - after all, these would be a lot like piano wires or guitar strings. I was also thinking about cross braces, but welding them in would probably warp the tubes to an unacceptable level - at least I'm not sure how to stop that from happening.

    Since I'm making the gantry with dual tubes, so I have a place for my big ball-screw nut, I didn't think the tensioning cables were going to be feasible there, although I'm considering some braces in between the tubes for stiffness.

    I thought about using I-beams originally (I've even got some lying around) but everybody said they weren't as rigid or straight as tubing of equivalent weight.

    Andrew Werby
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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    When we welded in our cross braces it didn't noticeably warp the tube. We were careful and welded things up in a set sequence. I'm sure there was some but it was machined after welding. If you could use it I'd give it to you. Too expensive to ship I'm sure.

    I've heard the same thing about I beams not being as straight as tubes. And being a little flimsy. I saw mine flex a little as I moved them around building my router, hoisting them and such. But it can work to your benefit in that you can place them straight and then lock them down. Once they are fastened in place they are no longer flimsy. There's also 2 distinct types of profile's: H beam and I beam. Depending on the application one is probably better than the other.

    Sent from my Pixel XL using Tapatalk



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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Quote Originally Posted by 1Jumper10 View Post
    When we welded in our cross braces it didn't noticeably warp the tube. We were careful and welded things up in a set sequence. I'm sure there was some but it was machined after welding.

    [That would definitely help, but I got a quote for blanchard grinding to true up my tubes, and it didn't make sense for this project (and my budget). I've decided to use epoxy to provide flat level beds for my rails. Did you take any pictures of the cross-bracing in progress? I'd like to see how you went about it.]

    If you could use it I'd give it to you. Too expensive to ship I'm sure.

    [How much does it weigh? And where are you located?]

    I've heard the same thing about I beams not being as straight as tubes. And being a little flimsy. I saw mine flex a little as I moved them around building my router, hoisting them and such. But it can work to your benefit in that you can place them straight and then lock them down. Once they are fastened in place they are no longer flimsy. There's also 2 distinct types of profile's: H beam and I beam. Depending on the application one is probably better than the other.

    Sent from my Pixel XL using Tapatalk
    I'll have to look at the beams I've got again, and try to figure out which they are.

    Andrew Werby
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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Last One - 4'x6' Steel, Epoxy and ClearPath servo's
    See posts #8 - 13 for how we welded in the braces. This was on an 6"x10"x3/16" wall rec tube.
    I'm in Michigan and the tube is heavy. I doubt UPS or FedEx would handle something like it. It would probably have to ship via freight. I'm sure its not worth it but if your ever in the area its yours.



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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    You certainly went the extra mile to ensure rigidity in that beam. It would probably hold up a house - in canteliever. But you say it went "egg-shaped" with the heat from all that welding? Or was that another one? How long is it?

    Andrew Werby
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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    No, it was a little "egg shaped" when we got it from the steel supplier. Not severely, but noticeable to the naked eye if you looked at the end of it. It might be more correct to say the 10" sides bowed out a little in the middle. It was just over 6ft long.

    If you look at the middle pic in post #12, you'll see how we welded a pad on the bottom and closed off the end. In your design, if you're going to drill through the top and bottom of the tube and then bolt it down to the concrete pillars, if you put the nuts on the top of the tube and dont somehow support the inside of the tube you will deform it with bolt tension. That was part of why I suggested you weld a pad to the bottom and bolt the pad to the pillar. I had forgotten that particular reason until I reviewed my pics. You might want to take anything I say with a large measure of salt



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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Look at mine


    I could add 2 more axes and go to 20' or more. I have placed 500 lbs on xy axis. had 210lbs on z axis. I am completing the documentation on he build. Should have it sone.



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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Quote Originally Posted by 1Jumper10 View Post
    No, it was a little "egg shaped" when we got it from the steel supplier. Not severely, but noticeable to the naked eye if you looked at the end of it. It might be more correct to say the 10" sides bowed out a little in the middle. It was just over 6ft long.

    [That's about the length I need, but I decided against a single beam for the gantry, since adding the ball nut would push the whole Z axis assembly way out, adding leverage in the wrong direction. I figure using two smaller beams connected with a stout plate would give about the same degree of rigidity while forming a recess that the nut could travel in.]

    If you look at the middle pic in post #12, you'll see how we welded a pad on the bottom and closed off the end. In your design, if you're going to drill through the top and bottom of the tube and then bolt it down to the concrete pillars, if you put the nuts on the top of the tube and dont somehow support the inside of the tube you will deform it with bolt tension. That was part of why I suggested you weld a pad to the bottom and bolt the pad to the pillar. I had forgotten that particular reason until I reviewed my pics. You might want to take anything I say with a large measure of salt
    I thought about that, but decided I could just slip a length of heavy pipe over the threaded rod as I stuck it up through the tube, which would keep it from deforming when I cranked down on the nuts. But I was thinking about end-caps, if only to have something to tension my cables against.

    Andrew Werby
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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Quote Originally Posted by CutMasterCNC View Post
    Look at mine

    [That's a pretty nice build, but have you used it as a router as well as a plasma cutter? Plasma cutters can be built a lot lighter, since they don't have any counter-forces to resist, and the action of cutting doesn't cause any vibrations that need damping. Routing, especially of hard materials, requires a much stiffer machine that's less prone to resonance.]


    I could add 2 more axes and go to 20' or more. I have placed 500 lbs on xy axis. had 210lbs on z axis. I am completing the documentation on he build. Should have it sone.
    Keep it coming!

    Andrew Werby
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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    I don't entirely understand the manner in which the spindle is mounted to the fifth axis gearbox.I would have expected the motor to be mounted by it's side and getting all the alignments correct is not the work of a few minutes.



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    Default Re: Concept Design for a new 6-axis router - take your best shot!

    Yes I have used it with a 2 hp router and a 5 hp spindle. That is why I had to legthen the plates from 6" wide to 12". With the six inch plates it tried to lift a little under heavy pressure from the router and spindle. Now even when I get to aggressive with a cut something else gives ..tool bit .



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Concept Design for a new 6-axis router - take your best shot!
Concept Design for a new 6-axis router - take your best shot!