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Thread: Tramming liquid touch plate

  1. #1
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    Cool Tramming liquid touch plate

    Hi, everyone.
    I am new and green. built a 3 axis cnc router at home. i was looking at the standard tramming and squaring procedures all around. meanwhile i had tested the Auto Z zero plate (with a piece of PCB) and the macro in Mach3. It worked nice.
    Now in order o square the z axis to the table, i had an idea. Use the auto z zero procedure, DRO and a plate full of water (Grounded) on four points around the z axis to get the error of tool tip in four directions. Just which is done by dial indicators attached to a rod in spindle.

    Any comments ??

    Similar Threads:


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    Default Re: Tramming liquid touch plate

    Might work in principle but you may run into an issue with the ripples due to machine movement, surface tension of the water and droplets hanging from the tip to screw up the distance. Otherwise, it would obviously require that the table itself is dead level or it will not be parallel to the water surface.

    Puzzle, Finger Joint, Maze and Guilloche freeware at https://fabrikisto.com/tailmaker-software/


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    Default Re: Tramming liquid touch plate

    Everything Jerry wrote.
    Sorry, but not a useful idea imho.
    Cheers
    Roger



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    Default Re: Tramming liquid touch plate

    hi Jerry,

    thanks for your kind reply. yes you are right. the issues of droplets, surface tension are valid. ripples can be reduced with a saturated solution of say... table salt. I aimed this for the verticality of z axis.Not for leveling of the bed.



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    Default Re: Tramming liquid touch plate

    Hi Jerry,

    So i plan now to go ahead as follows.

    My XY working plane is 1100 Y 700 X in mm.
    Use a float glass 12 mm thick say 700mm X 700mm placed under the spindle. Level it with 0.02mm/meter spirit level in both x y directions with shims. Fix it in aligned position with hot glue.
    Using milled aluminum plate 100 X 100 mm on this glass surface proceed to auto z zero script in mach3.
    The z axis is 2000 steps/ rev at 1/10 micro step. Typical error is 1 step for the motor. which comes to about 1/2000. for 5mm pitch it is 0.0025mm linear.
    Using MDI go to X10 Y10. Home. Auto zero Z. Record the reading from DRO.

    Repeat for the rest of three corners of the glass plate.

    Will this tell me the errors of the z axis alignment? which can then be corrected.

    After the Z axis is vertical, i can surface the complete spoil board.

    For your kind comments please.



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    Default

    Quote Originally Posted by shujaa View Post
    Hi Jerry,

    So i plan now to go ahead as follows.

    My XY working plane is 1100 Y 700 X in mm.
    Use a float glass 12 mm thick say 700mm X 700mm placed under the spindle. Level it with 0.02mm/meter spirit level in both x y directions with shims. Fix it in aligned position with hot glue.
    Using milled aluminum plate 100 X 100 mm on this glass surface proceed to auto z zero script in mach3.
    The z axis is 2000 steps/ rev at 1/10 micro step. Typical error is 1 step for the motor. which comes to about 1/2000. for 5mm pitch it is 0.0025mm linear.
    Using MDI go to X10 Y10. Home. Auto zero Z. Record the reading from DRO.

    Repeat for the rest of three corners of the glass plate.

    Will this tell me the errors of the z axis alignment? which can then be corrected.

    After the Z axis is vertical, i can surface the complete spoil board.

    For your kind comments please.


    Or you could just do this.

    https://www.youtube.com/shared?ci=efIpZaf8WdM

    I think you're way over complicating the process



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    Default Re: Tramming liquid touch plate

    Hi Eric,

    thank you for simplifying. your video is great.
    you have been a great help in clearing up my mind.



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    Default Re: Tramming liquid touch plate

    hi everyone,
    and eric

    i seem to have run into another wall. my gantry is heavy around 30 kg. moreover i am driving the longest axis with 2 stepper motors of 2.2 Nm. the screw is 16-5 single start ball screw and is fixed. the rotating nut assembly bearings and the pulleys are all steel. All in all the axis is capable of only 600 mm /min.

    Can i mill Aluminum// Perspex/Acrylic/MDF /Plywood plaques and badges and / or mill timing pulleys etc. at the measly feed rate.



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    Default Re: Tramming liquid touch plate

    At slow speeds the mass of the gantry or table is a benefit for stability.
    Plastics and wood should be no trouble. Metal will depend on the stiffness of the system, which is a completely separate issue.
    Try machining some plastic and Al, but with small passes: 6 mm cutter and 0.5 mm depth at 100 mm/min and whatever revs are convenient.
    After that experiment, mill a small 20 mm x 20 mm square 2 mm high and then measure it.

    Cheers
    Roger



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    Default Re: Tramming liquid touch plate

    Thanks Roger,

    it was a relief.

    will soon post photos of my machine.



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    Default Re: Tramming liquid touch plate

    Another secret is to use one or two final spring passes. That helps tolerances, especially with hard metals.
    Cheers
    Roger



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    Default Re: Tramming liquid touch plate

    Quote Originally Posted by shujaa View Post
    hi everyone,
    and eric

    i seem to have run into another wall. my gantry is heavy around 30 kg. moreover i am driving the longest axis with 2 stepper motors of 2.2 Nm. the screw is 16-5 single start ball screw and is fixed. the rotating nut assembly bearings and the pulleys are all steel. All in all the axis is capable of only 600 mm /min.

    Can i mill Aluminum// Perspex/Acrylic/MDF /Plywood plaques and badges and / or mill timing pulleys etc. at the measly feed rate.
    30 kg is nothing. The gantry of my midsize machine (with z-plate and spindle) is almost 90 kg. Driving x-axis with two 15mm pitch ballscrews and two 470 in-oz low inductance steppers @72Volt drive supply I can get reliably 300 ipm or more than 7000mm/min at decent acceleration. The 5mm pitch of your ball screws will reduce the max speed but at least the gantry mass should be even less of an issue.

    Puzzle, Finger Joint, Maze and Guilloche freeware at https://fabrikisto.com/tailmaker-software/


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    Cool Re: Tramming liquid touch plate

    well attached are some pics of my cnc router

    4' X 2'
    steel
    Bearings SBR16 LM UU Jinan Yuki
    All steppers NEMA23 2.2 Nm Changzhou Soya
    Dual Y 1:1 Fixed Screw Rotating Nut with HTD5M -25mm
    All Screw 1605-1 Start
    Z stroke 200mm
    1.5 kW Han qi spindle cooled with aluminum car heater core and centrifugal pump
    5 axis BoB sainsmart

    HP600B daisy chained 12VX3 power suppies for 37.5VDC, 24VDC, 12 VDC, 5 VDC
    Finder Control Relays
    Dell Optiplex Pentium 5

    Pentz cyclone DIY 3HP, blower, 6 inch flex

    hoping for review.

    Attached Thumbnails Attached Thumbnails Tramming liquid touch plate-control-box-jpg   Tramming liquid touch plate-z-axis-jpg   Tramming liquid touch plate-cnc-router-4-x-2-jpg   Tramming liquid touch plate-dual-y-z-x-jpg  



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