[操作疑難] 求救...印不到正方形

本帖最後由 isoloyou 於 2015-11-2 15:19 編輯

小弟打印2020
X:20.06     Y:20.17
差距有0.11mm阿!!!!!!!!

皮帶已經很緊,還有什麼做錯了

更新:
Delta 機

小弟打印2020
X:20.06     Y:20.17
差距有0.11mm阿!!!!!!!!

皮帶已經很緊,還有什麼做錯了 ...
isoloyou 發表於 2015-11-2 01:28


錯在連乜機種也沒有說

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我記得ching 好似用kossel. Delta 機係咁,三邊是旦有一樣野唔一致都會有咁情況。其實差0.11mm表現也不算差. 但印20mm 係check唔到乜。最好印個大D嘅8角形再check對邊。

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回覆 3# ustkl


    嘩....記憶力真好,就是Delta 機
    是不是傳統四方機會更準確??有沒有好介紹

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好似用diagonal rod length. 去做X Y ratio

好多post 講過,  你睇下offer 師兄的tune 機教學

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一般來說, Delta 沒有一套方法可以tune XY ratio, 能找到的教程只是tune XY 的尺吋, 而不是ratio. 因為太多原因能引致。最好的方法是確定所有零件三邊一致, 砌時小心確定各方面對齊。誤差就可以減到最小。要小心撿查個effector 是否正3角形, 有些商家可能用部ⅩY唔準嘅Delta print 俾你。到時點tune都冇用。

一般"四方機" XYZ 軸各自由一個motor 控制. tune這類機 比較單純, XY 尺吋,比例不對, 只要在firmware 改一改 steps per unit 就可以.

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本帖最後由 whitechunk 於 2015-11-2 17:40 編輯

唔豬得唔得

4- Calibrate the firmware to print to correct dimensions.

At this point the printer probably prints, but the results are dimensionally wrong.  Printing something 100mm long results in a printed object that is not exactly 100 mm long.  This also, can be corrected in firmware.  Adjustments to DELTA_DIAGONAL_ROD in the firmware control the size of the printed object.

Create a simple calibration object in openscad, slice it, and print it. By measuring the actual size of the object as printed and comparing it to the size in the design, the accuracy of the printer can be assessed and adjusted.

Here is my sample openscad object:

cube([100,2,2]));

If the length of the object is wrong, adjust DELTA_DIAGONAL_ROD:

new DELTA_DIAGONAL_ROD =
100 / measured_length * original DELTA_DIAGONAL_ROD

then re-upload the firmware, and print and measure again.  When the printed object measures 100 mm, the printer is printing accurately to size and is fully calibrated

And so what if, in the end,  the length of DELTA_DIAGONAL_ROD in the firmware doesn't match the length of the rods that were built?

Anyway this process seems to work for me. Good luck!

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唔豬得唔得

4- Calibrate the firmware to print to correct dimensions.

At this point  ...
whitechunk 發表於 2015-11-2 17:38



    呢個似係XY比例上問題,唔係獨立XY軸問題

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印20x20差0.11好大問題??
如果印200x200都係差0.11甘就小問題啦
有一點,是我學3dp這2年體驗得到的新手經驗,印cube tune機是必要的,精準度±0.1~0.2已可以應付日常使用,需知道,你要精準度±0是沒可能,卡尺一定準?用黎差考啫
你買部機返黎,是要每天不停印精準正方形?不會吧,印多邊不規則才是它的工作吧!
精準度同金錢是反比的,金錢越多±越少
ustkl 兄已提到,三角關係<--這個不好亂搞了

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