Yeah, i talked to the manufacturer and minimum is 40kN and recommended 45kN. I also find it extremly high, i was a bit surprised that it was so high. I don't know if there is double springs or not....
I solved it with a block cylinder:
https://shop.amf.de/application/amf_...SEITE:Liste)=Z
...together with a pneumatic pump:
https://shop.amf.de/application/amf_...SEITE:Liste)=Z
....with the correct pneumatic valves and pressure sensors and a bit of control, I believe i'll get both a fairly fast release and the pressure i need to release the tool...I'll know later if this works :-)
The issue is not as much the connectors, but more the "dynamic" bending of the those/tube inside the cable-chains when the saddle or the table is moving... this radius is very small in my setup and this will cause premature fatigue or kinks in most tubes...so the challenge is to find a tube/hose which allows for very tight bending during movements....
It seems like the AMF shop does not like me linking to their items...so the links above dont work :-(
Anyways, their catalogue is here:
https://www.amf.de/files/amf-assets/...ng-Systems.pdf
I've ordered their air-hydraulic pump order no "69450" together with a 24V valve(no. "259242") and a clock cylinder with orderno "63461" ....
...soooo, my old gardenhose aint going to cut it? ;-)
I talked to a local hydraulics supplier and they had no problems supplying the correct hosing for the connection, they just needed to know the final length i wanted. So my plan is to get everything mounted, measure the required hose-length and then have them make the proper hose for the connection...
Do your hiwin rails have channels running on the underside or are they fully flat?
The rails have two groves on the underside, but otherwise flat:
We had a lot of problems getting things as "flat" as we wanted when the rails were mounted. The rails "twisted" in all sorts of directions after mounting, not much, but it wasn't "perfect". So we ended up machining a grove for the middel part so the rail "only" rests on the two outer flats:
...after this the "flatness problems"(twisting) went away....my/our theory is that i've designed the mounting surfaces wrong and should have "counterbored" the mounting holes... the teory is that when i torque down the bolts in the rail i actual "lift" the metal around the thread in the mounting surface and this causes the rail not to sit flat against the surface(the surface around the threads are "bulging" up and preventing the rail to touch on the outer edges)... With the slot machines around the thread there is room for this "bulge" and it can now sit flat and the weird "twisting" disappeared....if i were to design it again i could have "counterbored" the threaded holes in the mounting surface a couple of milimeters to avoid this in the first place...
i don't know if this makes sence or answers your question :-)
Thanks, it does, seems like a design flaw on hiwins part. On their newer ones CG they went away with the middle part
Have to think more about it or just go one size smaller size20 rollers have no grooves, fully flat.
are you happy with CTB's servo drives? Have you had a chance to test them out yet?
Yeah i've been testing them, but not really been putting them through their paces just yet. Everything seems to work fine through EtherCAT. The only thing i cannot get to work(yet) is the motorload feedback from the driver to LinuxCNC. I'd like to show the load of each axis and the spindle, but it seems to only return 0 whatever i do. I've talked to a couple of engineers at CTB about this and it should work, so it might just be because i've misconfigured something in either the driver or in LinuxCNC...it woudn't be the first time this happened ;-)
I'm currently wiring all the motors and sensors and plumming the spindlecooling...i'm currently struggling with "humongous" leadtimes on the Beckhoff EtherCAT modules i need for all the sensors, valves and stuff, ETA is in August(6months from now!):-/ But when all this is done i'll hopefully be ready for the first real movements of the machine...then i'll be able to give more information on the CTB-stuff...
you have 35 size rails right? what's the diameter of the pin that you use to push the rail against the edge? where did you get them?
Last edited by ardenum2; 01-28-2023 at 05:53 PM.
I've used 4mm dowel pins. I tried 3mm but i thought they were a bit too small for my liking. I actually made a small test-jig where i mounted one of the countersink screws to figure our the correct size and the correct distance. I just found my original drawing with the 3mm pin:
I kept the 41mm distance, but changed to 4mm during assembly...but make sure to test it for yourself and not just use my drawing, the head of your countersink bolts might be different!
You can buy these pins in almost all "professional" hardware stores. I bought mine at a local "bolt supplier"(mw.dk), but you can buy them online aswell, like this one: https://uk.misumi-ec.com/vona2/detail/221000596803/