| The Breakroom > The Water Cooler |
| CNC mad |
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| mattinker:
I suggest that you put the question to John Dammeyer on the https://groups.yahoo.com/neo/groups/e-leadscrew/info Yahoo ELS group, you'd get a far better answer from him! Regards, Matthew. |
| RotarySMP:
Threading with a single count encoder works pretty well, as you can cnc thread at much higher spindle speeds, an multi pass with lighter cuts. Bogging down the spindle to a dead stop is not going to give you a usable thread on a manual machine. That is an extreme, unrealistic conpasison. I use turbocnc for years. It also only supports 1/rev indexing. Using a four count encoder an tell the software that your leadscrew pitch is a quarter would only work for single pass threading. You would have a 75% chance that a second pass wont line up. EMC is set up for both an index pulsr plus an encoder. It is no big deal setting that up. It is jusr 2x what you need anyway. Mark |
| hanermo:
First time ever I disagree with J. Stevenson. A single pulse will thread very well on a converted lathe. Mach3 will also thread very well. IF you have done the refit properly. BUT... We confirmed this when I worked with Kslilabs/Centipede, to develop and debug the threading stuff. Normal index pulses were crap ! and this is a big part of the problems people encouter. We used a 633 Mhz bus, and logged the signals into memory, and Sergey then plotted these. It showed clearly, that the problem was the index pulse being fuzzy and wandering. After that Sergey developed his index pulse board, that triggers clean pulses. I could then re-thread on a cold lathe, at 320 rev, vs a warm lathe at 340 rpm, and the tracking would be within 0.01 mm through a 30 mm long 1 mm thread. On a copper pipe, where the new groove was very visible vs the old groove, and it tracked perfectly. This just proves that; 1. 1 index pulse is enough 2. most index pulses are no good Btw.. Apparently the ELS also threads well. |
| hanermo:
I am now installing new brushless ac servo drives on x,z,c axis. I expect to make great threads, soon. Last mount is done, need to broahc some pulleys and make some supports and stuff. I also am very much looking forward to the new *servo spindle* as c-axis. 2.5 kW AC brushless, 10 Nm continuous (30 Nm peak). |
| awemawson:
--- Quote from: hanermo on February 18, 2015, 10:41:51 AM ---First time ever I disagree with J. Stevenson. --- End quote --- :hammer: :hammer: Whoohay ... fighting talk ...... :poke: :hammer: :hammer: |
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