for those of who are curious about reduction ratio, I found later that ratio of any harmonic gearhead differs depending on how they are mounted. with the above setup, it is 51:1 but the other way, it can be 50:1, you don't ask me why, cause I don't have deep knowledge...
With 51:1 reduction? I don't believe any possible backlash from the belt system would result in meaningful error. And there is the tension adjuster. Thanks for attention!
you likely had the broken tool because of the recut chips, little tools are very sensitive to recut chips. Beautiful build though, so simple and functional!
HI, I'm looking for very similar (if not exact) pulley as your 48 tooth pulley with a through bore (@ 0:44) Do you happen to have a part number or a reference where to find them?? THanks! Great video
O hey. That specific pulley(S3M/48T/10mm) was attached to the harmonic drive when I bought it second-handed so I didn't care much, but I believe you can find replaceable parts from here -> us.misumi-ec.com. I have ordered all other pulleys that were necessary when I built my CNC/rotary axis from official Gates dealer companies. They accept orders of small quantities, but of course its a bit expensive. Wish you a good luck!
Anything is possible and it all depends on what you will be doing with it. If you can live with the backlash from worm-geared-reducer and can play for fun... though I wouldn't recommend it for any dimension-serious stuffs...
Never actually tried to measure backlash, reason as the below answer. Stiffness is another issue, but it meets my requirement so no problem to me. One idea is to prepare some molds and make whole stuffs again using cast iron but well.... that's completely another story.
I know what you are thinking. Grooving on a rotary axis is the last method that should be taken. The narrower, trickier. If a rotary axis is the only tool that you can operate to make a groove, you can surely make a gcode with dia.2mm endmill, d.o.c like 0.3mm each path, however, that really isn't a good idea. A rotary axis is NOT a lathe compatible. I wouldn't even try that as long as I have an operational lathe. Hope this will answer your question. Cheers!
Sorry bro, that's not available. That unit was from my neighbor scrap shop, USD150 around, I guess it woube be about double that price in eBay(or more)....
for those of who are curious about reduction ratio, I found later that ratio of any harmonic gearhead differs depending on how they are mounted. with the above setup, it is 51:1 but the other way, it can be 50:1, you don't ask me why, cause I don't have deep knowledge...
Nice design... I've been scouring TH-cam and the web for the various ways to mount these harmonic drives, and yours is pretty close to what I want.
tks buddy, I love this small toy very much, though not desiged for heavy duty, it cuts anything other than steel very good :)
Very nice looking 4th axis great job buddy probably a nice handy addition to your milling machine
tks buddy, I think this isn't proper material for real milling task due to flex. I may make another one using my own cast-iron in the future :)
I enjoyed watching this! Thanks for taking the time to make this video and for sharing it with us.
Mark
tnx for the comment !
Doesnt driving it by belt defeat the whole purpose of a harmonic drive. Precision movements for long periods without the worry of backlash.
With 51:1 reduction? I don't believe any possible backlash from the belt system would result in meaningful error. And there is the tension adjuster. Thanks for attention!
you likely had the broken tool because of the recut chips, little tools are very sensitive to recut chips. Beautiful build though, so simple and functional!
can be one of reasons, but doc was 1mm with 2mm tool, which I didn't realize until I broke that tool, tnx for the comment :p
verry good, congratulations!
HI, I'm looking for very similar (if not exact) pulley as your 48 tooth pulley with a through bore (@ 0:44) Do you happen to have a part number or a reference where to find them?? THanks! Great video
O hey. That specific pulley(S3M/48T/10mm) was attached to the harmonic drive when I bought it second-handed so I didn't care much, but I believe you can find replaceable parts from here -> us.misumi-ec.com. I have ordered all other pulleys that were necessary when I built my CNC/rotary axis from official Gates dealer companies. They accept orders of small quantities, but of course its a bit expensive. Wish you a good luck!
Its ok if use worm gear reducer to coupling stepper motor and lathe chuck head than belt?
Anything is possible and it all depends on what you will be doing with it. If you can live with the backlash from worm-geared-reducer and can play for fun... though I wouldn't recommend it for any dimension-serious stuffs...
maybe wrapped rotary would have helped because you can use the whole flute length.
Interesting work. Did you measure the backlash as well as stiffness of the output?
Never actually tried to measure backlash, reason as the below answer. Stiffness is another issue, but it meets my requirement so no problem to me. One idea is to prepare some molds and make whole stuffs again using cast iron but well.... that's completely another story.
Could you have done the lathe groove operations on the 4th axis with an end mill (rotating)? Have you experimented with that?
I know what you are thinking. Grooving on a rotary axis is the last method that should be taken. The narrower, trickier. If a rotary axis is the only tool that you can operate to make a groove, you can surely make a gcode with dia.2mm endmill, d.o.c like 0.3mm each path, however, that really isn't a good idea. A rotary axis is NOT a lathe compatible. I wouldn't even try that as long as I have an operational lathe. Hope this will answer your question. Cheers!
Cool work. Can you send a link where you purchase that harmonic set up.
Sorry bro, that's not available. That unit was from my neighbor scrap shop, USD150 around, I guess it woube be about double that price in eBay(or more)....
may I ask you which postprocessor you are using in fusion360 for Mach3 with 4th axis?
Sorry for the late response, I remember it was bundled already in Fusion 360.
What power of servomotor did you use ?
that's a 100w Yaskawa servo with 50:1(I mean 51:1) reduction, 50W would do the same with such reduction ratio I guess.