Getting ready to order my 1000mm Leadscrews and want to make sure that I get the right ones. Building the Heavy Version and at moment staying with NEMA 17 motors (will switch over to NEMA 23 later). A little confused by a pitch/starts for the T8. What advantages/disadvantages to using T8-2 vs T8-8? Speed? Torque? I do plan on cutting light aluminum plate occasionally with this machine. Any thought/suggestions as to what others who have built or are building this machine are using would be much appreciated. Thanks go out to Topsie for making this possible and to Snorky for his excellent build log and to all the other forum contributors for their valuable information.
Hello Larry,
the T8 / 8 will give you better speed and flexibility of use of the CNC, the T8 / 2 will give a low speed and may even make the ARDUINO buggy.
Sorry for this Google translation 😬
Thanks Eric for the info. Just what I was thinking but wanted to bounce it off others who have more knowledge. Years ago I built a DIY 4x8 wood router CNC and kept my NEMA 34's and NEMA 23 anticipating some where down the road I would build another CNC. Topsies heavy was just what I needed. I still have my software (Vectra and VCARVE as well as MACH 3. Initially, my redo of this will be using the Arduino/SHIELD combination (with NEMA 17's to start) and GRBL. Eventually, I may shift to using my original parallel breakout board with my larger drivers and NEMA 23 steppers. This should retrofit Topsies Heavy CNC fairly easily and get me back to MACH 3 which I have worked with in the past. Thanks again!
👍
Mine is mounted with SFU1204, so lead of 4mm (half of a T8-8). And with the RPM max of my stepper nema 23 motors, even I got a strong torque, the machine is quite slow (1200 to 1500mm/min -> 350 to 375RPM max)
By the time being, I use a 24V power supply (16A), but I read yesterday that the RPM max depend of the voltage ( https://www.electronicspoint.com/forums/resources/stepper-motor-max-rpm.54/ )
I have a 280W48V power supply in my storage, It isn't enough to supply all my drivers, but is enough for my X axe, so I'll test if that article is right. Theoricaly I should reach double speed limit.
Does somebody already experiment the variation of RPM max according the voltage ?
Thanks
fred
@FredDeLain : did you take a look at tork curve from your steppers. On some their several curves for several voltage and amp. An exemple : https://www.upload.sorotec.de/doku/manuals/57BYGH450E.pdf
Good advice, but I didn't really found the curve for my motors (23HS30-3004S and 23HS45-4204S). I only found one showing the curve 36V 0-420RPM. (https://www.omc-stepperonline.com/download/23HS45-4204S_Torque_Curve.pdf) But according the average of similar motors, I'll switch from 24V to 48V power supply.
Fred
