Dyna Mechatronics DM2800

[mike-f]

OK a bit of an update, after a lot of looking I eventually found the GT2 or 2GT belts are not only a close match to the originals but also stronger than the originals. This did of course mean replacing all the pulleys, The belt I decided on gave me an almost identical centre distance which is good as the machine has no provision for tensioning the belt!

Belt Spec: GT2-132 66T 10mm width with 50T and 20T pulleys

Both the motor and leadscrew pulleys needed to be modified, the leadscrew pulleys are threaded and screw onto the end of the leadscrew, to allow for pretension of the angular contact bearings that support the leadscrews. The motor pulleys had to be shortened, this was to allow for the wider pulley width. Images below show the new and old pulleys and machining the new pulleys to fit.





With the pulley and belt issued solved I started work on the control electronics, The original control cabinet was a total loss so everything has been replaced, I went for UCCNC UC300ETH 5LPT and the matching UCBB breakout board, this has high speed opto isolated outputs and inputs which has made interfacing a lot simpler. I am also making the move over to the dedicated UCCNC software. Below are some images showing the progress on the control panel, along with the original panel remains!




Among the nice features of this machine are the stepper motors, these are super low inertia disc stepper motors made by ESCAP as shown below:



The link below shows a motion test using the new belt and pulleys, running at 2500mm/min rapid.

https://youtube.com/shorts/m4e0w34zR...TCRlgBoYYA88JS