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Thread: How is everyone building a DIY CNC router system that maintains cutting tolerances?

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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Hi JFL - How long did it take to read? I've scanned through it once, was surprised it was 3 months worth!! and still not there...Peter



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by JFL4066 View Post
    Thank you for the info. I'm inclined to purchase cast aluminum jig plate. Not sure if I want or need T slots. May go with a 6 x 6 grid of 3/8-16 threaded holes.
    How thick?

    I'm thinking to do the same for a small 2' x 3' router I want to build. Plus a grid of 1/4" or larger dowel hole for fixturing. Did that on my tiny Techno Davinci 10" x 12", worked great for tiling banjo fingerboards for inlay and fret slotting. My son-in-law did it for me on his Haas mill - 1/4" dowel hole with 1/4-20 thread beneath. I have a couple of 1" and 1-1/4" thick used jig plates I bought cheap locally, very flat even if not cosmetically perfect. A 2' x 3' plate wont fit his machine, thinking to do it on my Bridgeport. Also thinking to cut t slots as well, wondering if it would move around from t-slotting, that's a lot of material from one face? Could also have it ground as a final step, Nifty Bar is right here in Rochester. Working with a very modest budget, need to be resourceful and scrounge. I've collected a few Techno gantry slide units to use as actuators, want to have dual x drive to allow for a well in the middle of the table for a tilting rotary later down the line. Also keeping my eye open for a "decommissioned" 3 x 4 granite surface plate to use as a reference surface for the build, can't imagine one of those getting too far out for that purpose.



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by dixdance View Post
    How thick?

    I'm thinking to do the same for a small 2' x 3' router I want to build. Plus a grid of 1/4" or larger dowel hole for fixturing. Did that on my tiny Techno Davinci 10" x 12", worked great for tiling banjo fingerboards for inlay and fret slotting. My son-in-law did it for me on his Haas mill - 1/4" dowel hole with 1/4-20 thread beneath. I have a couple of 1" and 1-1/4" thick used jig plates I bought cheap locally, very flat even if not cosmetically perfect. A 2' x 3' plate wont fit his machine, thinking to do it on my Bridgeport. Also thinking to cut t slots as well, wondering if it would move around from t-slotting, that's a lot of material from one face? Could also have it ground as a final step, Nifty Bar is right here in Rochester. Working with a very modest budget, need to be resourceful and scrounge. I've collected a few Techno gantry slide units to use as actuators, want to have dual x drive to allow for a well in the middle of the table for a tilting rotary later down the line. Also keeping my eye open for a "decommissioned" 3 x 4 granite surface plate to use as a reference surface for the build, can't imagine one of those getting too far out for that purpose.
    Peter may give you better insight on the thickness.

    Craigslist will usually have used granite surface plates a couple times a year. A 3 x 4 is usually the moving cost. You might want to call the nearest recertification service in your area for the surface plates. They may know who has one to get rid of. The farther out of date the certification is the more possible wear on the plate.



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by peteeng View Post
    Hi JFL - How long did it take to read? I've scanned through it once, was surprised it was 3 months worth!! and still not there...Peter
    LOL. About 5 hours with studying each picture and pdf file. I like the concept of bent metal plate gantry. The use of timing belts is interesting as well. Is there an effective controller that will keep the two X drives in sync? In your experience, how much will the gantry skew?



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Is there an effective controller that will keep the two X drives in sync?
    Just about every controller can do this.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
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    JointCAM - CNC Dovetails & Box Joints
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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Hi JFL - Controllers send out perfect in sync signals so if the gantry is walking its mechanical. The machine controller has a slave function which makes two outputs identical eg X with A. The gantry can skew due to various things going on when the power is off. But once on it stays wherever it is does not change unless crashed. Usually you have a home on each side and these are adjusted square. When the machine is homed it automatically squares if not quite square mechanically. Scoot my half sheet machine has springy columns and they need squaring occasionally. Best columns are SHS or RHS welded/brazed into the top and bottom bits. Make the columns as big, big as possible and the gantry as big, big (stiff as) as possible and the bearings as far apart as possible. Cheers Peter



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by JFL4066 View Post

    Craigslist will usually have used granite surface plates a couple times a year. A 3 x 4 is usually the moving cost. You might want to call the nearest recertification service in your area for the surface plates. They may know who has one to get rid of. The farther out of date the certification is the more possible wear on the plate.
    Thanks for the suggestions JFL. Something will show up, always does. Transport will be the real cost, will prob need to rent a dock ht truck rather than try to wrestle out of my van.



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by ger21 View Post
    "Is there an effective controller that will keep the two X drives in sync?"

    Just about every controller can do this.
    I'm planing to have an additional c axis, can a 4 axis controller handle y, z and twin x drives? Thinking maybe Acorn...



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    That would be 5 axis. I believe that Centroid is coming out with an expansion board to support additional motors, but you'll need to ask them if the software/hardware will support what you want to do.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by dixdance View Post
    I'm planing to have an additional c axis, can a 4 axis controller handle y, z and twin x drives? Thinking maybe Acorn...
    What you could do is run the 2 X motor drivers from the same step/dir signals.



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by JFL4066 View Post
    Thank you for the info. I'm inclined to purchase cast aluminum jig plate. Not sure if I want or need T slots. May go with a 6 x 6 grid of 3/8-16 threaded holes.

    Check out these Haas aluminum Sub plates. They are all over ebay and likely to be sufficiently flat and stiff out the box:

    https://www.ebay.com/itm/Sub-Plate-H...cAAOSw5QlbLQcz



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    Default Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by dixdance View Post
    Thanks for the suggestions JFL. Something will show up, always does. Transport will be the real cost, will prob need to rent a dock ht truck rather than try to wrestle out of my van.
    The cheapest way I found to buy a granite surface plate was to get a new one from Grizzly. Their freight shipping costs are reasonable too. I couldn't find a used one on ebay or craigslist for any less.



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How is everyone building a DIY CNC router system that maintains cutting tolerances?

How is everyone building a DIY CNC router system that maintains cutting tolerances?