Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: jimbod37 on June 24, 2021, 02:54:18 AM

Title: tool digs in
Post by: jimbod37 on June 24, 2021, 02:54:18 AM

I am using V Carve Desktop 10.5 while machining a sign the (Cncest CNC 6040) will cut the required depth for half the lettering then for no reason will automatically cut up to 3mm deeper. I haven't a clue what is going on, maybe I should reload my mach3 or V Carve program. Any help will be appreciated. 
REgards  Jim

Title: Re: tool digs in
Post by: Graham Waterworth on June 25, 2021, 10:24:30 PM

Is this a new build/machine or has it been run before with out this problem.

If its new I would slow down the Z axis and give it moor acceleration time, it could be the head is missing steps on the rapid up moves.

Are the Z axis slides well lubricated?
 

Title: Re: tool digs in
Post by: jimbod37 on June 26, 2021, 02:59:37 AM

Graham
I have found the problem after pulling the Z axis apart found that the ball nut and lead screw had 3-4 mm of play the steel nut has a nylon nut about 5 mm thick at each end one of these had come loose, the ball nut and the lead screw have the 3-4 mm of play and the nylon nuts must be designed to take up the slack. I have looked up the net and cannot find anywhere to buy a new nut or a screw and nut as the screw is 11.5 mm most likely 12mm will have to keep trying to find a replacement. Thanks for your reply. Jim

Title: Re: tool digs in
Post by: Graham Waterworth on June 26, 2021, 01:11:45 PM

Worth a look :-

https://www.ebay.co.uk/itm/352984811584?hash=item522f88c840:g:wyYAAOSwiI1eV4rY (https://www.ebay.co.uk/itm/352984811584?hash=item522f88c840:g:wyYAAOSwiI1eV4rY)

Title: Re: tool digs in
Post by: jimbod37 on June 27, 2021, 02:22:22 AM

I looked up the site you sent however after setting up the router I find the  Z axis works fine without any slack however the problem is still there. You mentioned slowing down the axis again no joy It would appear that when pecking the x axis clunks and the tool digs in. What do you think ?

Title: Re: tool digs in
Post by: Graham Waterworth on June 27, 2021, 09:17:30 PM

Stop procrastinating and fix you machine mechanics before you go any further.