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davy182 Machine precisely off. 03-14-2018, 02:42 AM
davy182 Just checked holes are within... 03-14-2018, 02:53 AM
A_Camera Re: Machine precisely off. 03-14-2018, 01:01 PM
A_Camera Re: Machine precisely off. 03-14-2018, 03:25 PM
ger21 Re: Machine precisely off. 03-14-2018, 01:53 PM
A_Camera Re: Machine precisely off. 03-14-2018, 03:14 PM
Jim Dawson Re: Machine precisely off. 03-14-2018, 03:56 PM
ger21 Re: Machine precisely off. 03-14-2018, 04:10 PM
A_Camera Re: Machine precisely off. 03-15-2018, 09:04 AM
ger21 Re: Machine precisely off. 03-14-2018, 04:08 PM
davy182 Re: Machine precisely off. 03-15-2018, 02:07 AM
A_Camera Re: Machine precisely off. 03-15-2018, 09:40 AM
  1. #1
    Join Date
    Mar 2003
    Posts
    35494

    Re: Machine precisely off.

    If your pitch is off .001" in 5", and you calibrate for a 5" part, you'll be off .02" on a 100" part.
    If you calibrate the machine at 100", a 5" part will be off .001".
    I'd prefer the latter.
    Gerry

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

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

  2. #2
    Join Date
    Apr 2013
    Posts
    1916

    Re: Machine precisely off.

    Quote Originally Posted by ger21 View Post
    If your pitch is off .001" in 5", and you calibrate for a 5" part, you'll be off .02" on a 100" part.
    If you calibrate the machine at 100", a 5" part will be off .001".
    I'd prefer the latter.
    Yes, but I am talking about calibrating 5" to 5.000" and NOT to 5.001". As I said, this assumes linear inaccuracies. If your screw is perfect at one end and off somewhere in the middle and so-so the other end then you have to chose what is important. Making 5" cuts and measure the cuts over the 100" table would tell would tell you if the screw is linear or not, and where it is the worst/best. If the pitch is off then that can be adjusted by the steps per value to get accurate cuts. That's what I did with my machine, after all, a 1605 is NOT 16.000mm in diameter with 5.000 mm pitch, but a little more or less, so taking some reference measures and adjusting the steps per values are necessary. This is common practice also with 3D printer, where the differences can be even more.

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