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Type: Posts; User: steve123

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  1. Replies
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    Re: Spindle not square

    Here is a video that describes Tramming.

    https://youtu.be/BXuILLXSpqs
  2. Thread: Desktop Steel

    by steve123
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    Re: Desktop Steel

    I read that as 1 = up, 0 = down.

    101 = 2.7A
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    Re: linearmotionbearings2008 = RUBBISH

    .
    This is disgusting. Nobody should ever offer money for positive feedback. I was going to use LM2008 for ball screws, as they seem to have the best feedback! Now I have to look elsewhere....
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    Re: Robotic arm tool changer?

    Robotic arm tool changers:

    GMTK https://www.youtube.com/watch?v=Xn7tsNG6pyo
    Fermat https://www.youtube.com/watch?v=_nQTprRXSUA

    Just possibly out of your budget, but beautiful.
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    Re: Heavy Table Concept for Cutting Steel

    My build will be an attempt at this (if I can ever finish it). Envelope 3x4.5'x7"z Table is 3x4'x8" granite surface plate, 1500 lbs. Gantry is 3x5"x3/8 steel tubing, 2 beams with webbing between,...
  6. Re: [PCNC440] Bored? Let's play "guess the final diagnosis!" with a problem with my 4

    Try cutting the acceleration in half as a test.
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    Re: Belts and suspenders - DRO on CNC machine?

    It's all academic if your parts are coming out to spec. If they are, just sit back and have a beer. :cheers: A C7 ballscrew has about .002 variation per foot. That said, we don't know how...
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    Re: JB-Weld! Will it come apart?

    I wonder if your epoxy didn't actually cure all the way. I had some (old) epoxy that I tried to fix a car mirror with. The mirror fell off after a week, and I saw that the epoxy was still a little...
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    Sticky: Re: 18x18 Linear Rail Tormach Build.

    Do you have good airflow across the drivers?
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    Re: Dual Y axis ballscrew

    I'm not sure they even should be coupled, but I would look at other things than how the two are coupled first. Some pictures would be useful.

    There are several things that add together to give...
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    Re: MORE HP for PCNC

    Can you please post the model and source when you can for:
    Motor
    VFD
    Pulley
    Belt

    You are running on standard 220vAC single phase, right?

    I don't want 5 HP, but maybe they have something in...
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    JB-Weld! Will it come apart?

    I figured I would try making a flat surface on the beams by coating them with epoxy and laying them on the granite surface plate. I was really worried about getting the epoxied beam back off the...
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    Hand Scraping X beams

    I decided to explore ways to get the X beams flat. I started with hand scraping. My first objective was to get any rock/twist out. I purchased a scraper from A&W precision, and Dapra water-based...
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    Re: *Large* CNC Router Build

    Here is another video of the HSM modal mill cutting foam. The gantry structure is interesting.
    https://www.youtube.com/watch?v=BMYJB5Ikb3Y
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    Re: Large Epoxy Granite Vertical CNC Mill

    This is the first time I have heard of this problem with end machining and ball nut quality. Please post the name of your ebay ballscrew source so we can possibly avoid them. Please PM me if you...
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    Re: Ball screw lead torque

    Please give the length of your ball screw. The ball screw inertia can be more than your "load" depending on diameter and length.
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    Sticky: Re: 18x18 Linear Rail Tormach Build.

    Geckos are supposed to be GOOD at handling resonance. It sounds like that isn't your experience until now. I did some looking at the Gecko site and saw these two options for the G201X:

    3.) ...
  18. Replies
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    Re: Steve's 3x4' Gantry Mill

    I blew the holes out with compressed air, and sprayed them with the pump sprayer, and blew that out. I also got a tubing brush from Harbor Freight and used it in a drill. I am going to stuff some...
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    Re: Steve's 3x4' Gantry Mill

    How to finish drilling before I am an old man?

    I started out just pushing on the drill. I couldn't keep that up. I next tried this:
    289842

    The string trimmer line runs across to... A half...
  20. Replies
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    11,017

    Re: Steve's 3x4' Gantry Mill

    Drilling Granite!
    I wasn't sure how this would go, and it took some doing. I have 20 holes to drill! I start with purchasing a very high quality water swivel and diamond drill bit. As I recall,...
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    Re: Steve's 3x4' Gantry Mill

    I made 3/4 x 1.5" stainless (303) inserts. These pretty much look like the ones I have seen on the web. These will be epoxied into holes in the granite plate. I will drill and tap the shorter ones...
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    Re: Steve's 3x4' Gantry Mill

    I finished up welding the gantry legs. Those are 3/8" and 1/2" steel now.
    289818 289820
  23. Replies
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    Re: Steve's 3x4' Gantry Mill

    As a mater of fact, yes!

    I made 8 brackets out of 1/2" x 4" angle. I welded in triangles to eliminate flex. I then machined the two faces flat and perpendicular. I got a 1/2" carbide end mill...
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    Re: G0704 Linear Rail Conversion

    Great idea and execution. I'm wondering about the pre-load on the linear carriages you got. I know they come in "light", "medium" etc. I have heard that light pre-load was a bad idea for machines...
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    Re: Epoxy for leveling linear rails

    Here is some research I did a year ago, posted in my build thread.

    Here is the scoop on self-leveling epoxy

    I have to say up front that I have no relationship with Precision Epoxy. I'm...
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    Re: My third build, all steel this time!

    I was thinking something like that. Put in some partitions (starting in the center). Put a few bolts sticking into the void in an inch above the partition from the sides/top/bottom. These will...
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    Re: My third build, all steel this time!

    I like your epoxy work a lot. I plan to do something similar.
    I hope you are planning on closing off the ends of the gantry beam, or it will parallelogram on you.
    Nice work!
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    Re: Steve's 3x4' Gantry Mill - Gantry ends and welding

    Here is a beam after welding in a plug. 262910

    Truing up the ends 262912
    The two beams are within .005" in length. I THINK that's good enough.

    First test fitting! I had to file some high...
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    Re: Steve's 3x4' Gantry Mill - Progress!

    I got some metal cut by BK Customs. Some of it was water jet, the rest was laser.
    262900 262902

    Here is one of 3 spreaders for the gantry beams ready for welding. 262904

    Here are the plugs...
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    Re: Steve's 3x4' Gantry Mill

    I pulled the trigger. Finally. (OK, 3.5 years in design is might be a bit much). I purchased the 3x5x.375" beams for X and Y. Wow, those are heavy! 95 lbs for each X, 65 for each Y beam. I think...
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