is this controlled via LPT port? please check the port settings in windows device manager->ports(COM&LPT)->ECP printer port->properties->port settings->check the "use any interrupt assigned to the port and uncheck the "enable legacy plug and play detection this is to prevent to many unnecessary resources accessing the LPT port disturbing the Step signals sent to the Stepper Controller box

I'm having issues with Z axis lossing holding power during a job....I've rewired and played with tuning to a crawl....its not binding...but Z axis hold power get very weak 10 minutes or less in to a cut..any suggestions?

i have the same problem sometimes so i think this is happened when you use a heigher speed (big distance) or slower speed ( in small job)

Me Too, I had issues with this from day one, I thought it was a PC issue because my PC would lock up when I opened Mach3 so I replaced the PC with a newer one running windows 7 pro. When I first did this I was able to cut out a few parts perfectly, but the next time I fired her up, she started with that hard clunking sound when moving from one feature to the next, in other words it is not losing the steps while cutting but when there is no load on the tool, it is just moving to the next feature. I have ruled out mechanical binding and there is no backlash detectable.

27/5000 decrease velocity.

Das Problem war für mich schwer einzugrenzen, aber einfach zu lösen. Die Gewindestangen waren auch nach einer (von mir selbst verpfuschten) Reinigung immer noch voll Frässtaub. Dachte, dass ich gut genug gearbeitet hätte, was aber nicht der Fall war. Hab dann die Führungsmutter plus die Gewindestange in einem Ölbad blank gereinigt, bis wirklich kein Schmutz mehr zu finden war. Nach dem Einbau läuft die Machine auch heute (Jan/2019) immer noch supergut. Ich nutze zur Schmierung inzwischen kein Fett mehr, sondern nur noch ein paar Tropfen Schmieröl. Zudem reinige ich rund alle 5-6 Monate diese Elemente. The problem was not easy to find but easy to solve. The lubricating grease on the leadscrews on x and y axis where full of shavings and dust (in my case wood an aluminium). The result was, that also the T-Nut was full of that kind of dirt and fast movements where blocked. I thought that I cleaned that parts, but I did it not good enough. After a real good cleaning in an oil bath until there was REALLY no more dirt on it, the machine worked fine. Now I am only using drops of good oil and no more grease plus cleaning of that parts every 5-6 months. My machine works still very fine (201901 now) and I am really lucky with it.

I have the very same problem on the very same machine! How did you solve it?

look at all structure screw, guides etc and just fix, its nothing

Is leadscrew totaly straight ?

Hallo Manfred, konnten Sie das Problem mit Ihrer CNC-Maschine regeln? Ich hab das gleiche Problem.

hi, did you find the problem? I have the same too.

Hi , I had the same problem losing steps. I used this product(UC100 USB to Parallel Adapter) to take the load from mach3 on a crappy computer. Well worth the cost. Bradley.

das video ist richtig coll

das video ist richtig coll