Ohmarinus, what balls and magnets are you using? by the way, when you claim you never know (the holding force) - why don't you run a simple test with weights?by ooly - Delta Machines
jcs, thanks. by the way, your presumption is wrong - in the chinese joints I use the balls are not magnets. the brass barrels are ( a magnet is set inside) . the balls come with m3 short screws and are very convenient for assembly. I have just noticed that the magnetic force is strong enough to slowly unscrew the balls from their seats because of the back and forth joints travel. so I now usby ooly - Delta Machines
jcs - have you ever measured the holding force of your joints?by ooly - Delta Machines
continuing tests with the 0.1 mm adhesive teflon tape, I noticed there is a small creep of 2-3 hundredths after the movement was seemingly stopped. here are some photos showing the 0.25 mm teflon "hat" preparation: a hat after shape forming: (squeezing a ball into the socket) [1drv.ms] magnet barrel assembly, with hat in place:by ooly - Delta Machines
a question to jcs: in the five years you are using your delta printer, have you noticed any change/degradation in performance? what speed do you use in printing? I have tested today positional repeatability with a 0.08 mm adhesive teflon tape and the results are close to the 0.25 sheet teflon. the holding force is of course higher, which is good. I don't know if it is the same tape as yours.by ooly - Delta Machines
JCS: I apologize ! I wrote your name as JCB instead of JCS,but you easily realized it is you... frankvdh and jcs: I realize the still image is not clear and my explanations need more details. it's night here but tomorrow I will add videos and still images plus more detailed explanations. the preparation of the teflon will hopefully be made clear. by the way it is very easy to make and installby ooly - Delta Machines
I am now testing my self designed and recently built delta printer. I am using chinese magnetic joints, 13 mm balls and same diameter sockets, which are stated as having 50 N holding force. from the beginning I had a vague suspicion that the high friction in the joints can cause: - wear and tear - somehow, because of the "stick-slip" effect, it will affect accuracy I searched for information aby ooly - Delta Machines