Threaded View
-
23-02-2014 #1
Hi,
I'm new to CNC machining and have just bought one of these Chinese 3020 machines. I'm happy with the build quality and cutting ability for what I need to do, but I have a problem with the size of the things I'm cutting with it.
The Problem:
The items I cut with it are not the correct size!
Basically, when I'm trying to mill a hole of 10mm, it comes out as ca. 9.8mm. When I mill a hole of 80mm, it is pretty much spot on (that's strange...). When I mill a square, of 50mm, it comes out at 49.7ish mm... However, a 100mm square came out as 100.3/100.4mm...
What's confusing me:
It's not a linear increase of the deviation. It's always around 0.2-0.4mm.
My setup:
I'm using Mach3 and gcode that was generated by HSMexpress in Autodesk Inventor.
The steps/mm are set as per instructions and when I'm moving the axis individually, it is quite accurate. Not spot on, but at the same time I probably introduce measurement errors myself.
What I tried:
- Changed the dimension of the cutting tool setting in Mach3 and HSMexpress. Didn't help.
- Changed feed rate, spindle speed and acceleration. Didn't help.
- Tried different positions on the curring table. Didn't help.
- Checked that the axis scaling in Mach3 is 1.00.
- Checked for backlash/shaky axes. Everything seems to be alright.
Has anybody come across a similar problem before or knows, what the cause might be?
I tried searching the web and this forum for hours already but haven't found a solution...
Many thanks
Clemens
Thread Information
Users Browsing this Thread
There are currently 2 users browsing this thread. (0 members and 2 guests)
Similar Threads
-
Mach3 and CNC3040 incorrect zero location
By RoyT in forum Artsoft Mach (3 & 4)Replies: 1Last Post: 30-10-2013, 03:29 AM -
LIMAC knife cutting machine and plasma machine, cnc router latest video
By therouterlady in forum Manufacturer NewsReplies: 0Last Post: 18-09-2013, 05:28 AM -
Portable CNC flame plasma cutting machine
By WandrinAndy in forum Machine DiscussionReplies: 0Last Post: 03-09-2013, 04:09 AM -
Cutting 1.6mm mild steel with a CNC machine?
By HankMcSpank in forum Machine DiscussionReplies: 4Last Post: 01-05-2012, 09:56 PM -
Ebay 3040 issue with mach3 - incorrect scale when machining?
By Wayne Kinney in forum Artsoft Mach (3 & 4)Replies: 6Last Post: 04-03-2012, 12:17 PM
Bookmarks