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  1. #25
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    Default Re: Jake's 4x8 CNC Build

    I was able to get a little work this done over the holiday weekend. Over the last few years I have been saving adjustable lally columns and thought they would be perfect for the stands to get the table level for welding. I drew inspiration from boat stands. I also found the the 2500lbs. capacity of my Dewalt saw horses to be a lie. Scared the you know what out of me!

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  2. #26
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    Default Re: Jake's 4x8 CNC Build

    A little more progress on the table. I hope to flip it over and start on the legs this weekend. So far the weld shrinkage has not caused too much distortion. I'm only welding 2" at a time. The center rail under the spoil board seems to have been the worst with a drop of about .060".

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  3. #27
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    Default Re: Jake's 4x8 CNC Build

    Great job keep up the hard work

    2 wrongs don't make a right
    But 2 Wrights makes a Airplane
    Kevin Matney
    www.Matneymodels.com
    734 - 848 - 8195
    "IN GOD WE 'TRUST "
    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  4. #28
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    Default Re: Jake's 4x8 CNC Build

    I have been putting in some late nights under the welding hood lately, and the legs are starting to take shape. I had the steel yard shear the 60" long x 3/8" plate to size so all I would have to do is weld them up. I didn't anticipate how much distortion this would cause. Most of the parts were ok, but the bottom 4" piece looked like a potato chip drill bit. Since I decided to add middle gusset plates I had to start with the bottom, weld in the gussets, and then the sides so I would have room to get the welder in there. It was challenging to say the least. After I welded the legs up I flipped the whole thing over.

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  5. #29
    Gold Member RCjunkie's Avatar
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    Default Re: Jake's 4x8 CNC Build

    How do you flip this think or move it?

    2 wrongs don't make a right
    But 2 Wrights makes a Airplane
    Kevin Matney
    www.Matneymodels.com
    734 - 848 - 8195
    "IN GOD WE 'TRUST "
    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  6. #30
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    Default Re: Jake's 4x8 CNC Build

    Quote Originally Posted by RCjunkie View Post
    How do you flip this think or move it?
    With a Bobcat, until now. I have reached and surpassed the capacity of my little Bobcat (743b). To flip it over I welded a steel caster on the rear of the table and pulled it out into the driveway. From there I was able to get it flipped from the sides. I ended up flipping it over several times and setting it on it's side to get to some of the weld locations. Man, I'm sore from lifting all this 3/8" and 1/2" steel..... Currently looking for a cheap forklift on Craigslist. If I don't find one, I will rent one.

    The 3/4" tap and machine feet showed up today from McMaster Carr so I will try to get those temporally mounted. The feet will mount to a 3/8 wall 4x4 tube that runs the length of the bottom of the triangle leg/foot.



  7. #31
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    Still at it. Added the 4” tube to the bottom legs. I’m 6’3” and like a working height between 32” and 36” depending on the task. My table saw is 34” and I really like the feel so that’s the height I’m going for. I started on the gantry beam this past weekend. It’s a monster.

    Slowly but surely working out the the drive motors. The Rexroth drive software has really helped. Another big help has been the technical advise from ClearPath and Atlanta Drive Systems. After some modeling they recommended using 10:1 gearboxes on the X and Y.

    I know.the debate over Clearpaths have been discussed many time on this forum, but after years of service how do owners feel about them now?

    One other question I have had for a while is the Onsrud design of having the electronics ride on the back of the gantry. It seems like a good idea as far as cableing but I don’t see anyone doing the same thing. What’s the downside to this approach? Vibration?

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    Last edited by JakeInCharlotte; 06-17-2019 at 03:45 PM.


  8. #32
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    Default Re: Jake's 4x8 CNC Build

    I’m still here. Work is super busy but I have found time to build a sweet welding table out of a sub plate I found at the scrap yard. Other tools I built this summer include a weld positioner, slow speed grinder, angle plate for the mill, Tormek drill bit sharpener, and a power scraper for metal.

    I scored a 3x6 B grade surface plate as a reference. Trying to find a local machine shop has been pretty frustrating. So I’ve decided to try to scrape the ways with my homemade power scraper. My plan is to put the surface plate on top of the table, level it, and use my new tenths test indicator off the plate.

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    The welding table build was spurred by a need to accurately hold and weld the gantry beam. This Stevens Engineering sub plate was a great find. After I got it cleaned up I must have made 700 or so plugs for it. I also welded up 6 steel Fireball Tool inspired squares for alignment.

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  9. #33
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    Default Re: Jake's 4x8 CNC Build

    Picked up a 5000# forklift to help me with the gantry beam build. The Bobcat was way too jerky and only has around a 1 ton capacity.

    Jake's 4x8 CNC Build-lift-jpg

    And I started working on the gantry beam to "leg?" mounting plates. 7" x 10" x 1" thick.
    Does anyone have some thoughts about a system to use positive stops at the gantry to leg joint to control alignment? Kind of like a lathe tailstock with allen screws to adjust it to center.

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  10. #34
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    Default Re: Jake's 4x8 CNC Build

    Finished the gantry bases.

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  11. #35
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    Default Re: Jake's 4x8 CNC Build

    The gantry is finally coming together. It’s seems like forever since I have worked on the actual machine. The welding table and “fireball”squares are working great. The table and squares took a lot time to build but totally worth it.

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  12. #36
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    Default Re: Jake's 4x8 CNC Build

    Thanks for the updates! This machine is becoming a monster of a router.



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