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Hi,I’ve been working on my Bridgeport 412, and everything was going great until I discovered that the Fanuc control for the spindle motor is broken. Initially, I considered using the STMBL project with the Fanuc motor, but I’m running out of time, and the massive transformer required to run it is proving to be a nuisance.I’m now thinking about replacing the spindle motor and driver with a Chinese one. The replacement would have the same power (5.5 kW) but slightly more RPM (4000 instead of 6000). Since the machine could have been configured for higher RPM originally, I think this should be fine. The only adjustment I might need is to make a new pulley if the old one doesn’t fit.My machine primarily uses EtherCAT, but the Chinese servo I’m considering doesn’t support EtherCAT. It does, however, have CAN control, and I could also use its analog control interface if needed. The dimensions of the motor seem similar to my existing one, though I’ll need to double-check this weekend.I’ve gathered some information from the Alibaba seller. The entire kit (servo motor 5.5 kW 6000 RPM, servo driver, wiring, and resistor) costs $600 USD, excluding shipping. I estimate shipping will be an additional €200–300. I’ve never ordered through Alibaba before, so I’m curious about others’ experiences with the platform.Since I’ve never done this kind of replacement before, I’d really appreciate any tips or advice. Does this seem like a good choice, or are there other factors I should consider? Have you had any experience with replacing broken spindle motors or drivers? Does the price seem reasonable? I’ve assumed that items purchased on Alibaba are similar to those on AliExpress, and my experience with AliExpress has been that they deliver exactly what they promise.Looking forward to your insights!

Links(hope these will work for a while):
Motors Drivers


Best regards,
Andries

 


unfortunately it doesn't work with this file at the moment? 

  File "/usr/lib/python3/dist-packages/qtvcp/widgets/camview_widget.py", line 80, in __init__
    self.SUB = str.maketrans("0123456789", "₀₁₂₃₄₅₆₇₈₉")
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: the first two maketrans arguments must have equal length


both variants would be practical, but for me it would be even better to use the set rotation angles
 

Quick question: What is the purpose of W1 and W3 for the Mesa 7i87?   Manual describe W2 but not a word about W1 and W3. 

Maybe this documentation helps:
linuxcnc.org/docs/stable/html/user/user-...gramming-the-planner

Are you building a custom control panel there?

Here is a version that use a sequence to change the diameter increment.
hold left button double click right button  increment + .5
hold right button double click left button  increment - .5

See if you like that. If not, yes we could just use the rotation increment for the diameter increment too.

This file must be named 'camview_widget.py' and replace the original file.

I need help with the main spindle motor.

DC Motor 34.5Kw
Independent excitement

Independent Brake

independent cooling

tachogenerator 60v 1000rpm



Can anyone shed some light on which driver I should at least study, or do we need more information

According to the electrical diagram, the old switching board had 130A, if you want I can scan the electrical diagram to help

hmnijp wrote:

You should increase motion blending tolerance (g64 p0.002)

The more accurate the tolerance -> the lower the speed.

For roughing operation (adaptive) such accuracy is not required. Try setting P0.05, this will smooth the trajectory and allow it to be executed at high speed.
If the acceleration of your machine is not high, then for roughing operation you can choose P even more.

Hi MR.hmnijp 
Thank you for the suggestion. I have applied your advice and made some adjustments. Previously, it was G64 P0.002 Q0.002. Now, I’ve changed it to G64 P0.01 and removed the Q0.002 parameter. The machine runs much more smoothly, although there are still some slight jerks when transitioning into curves during G0 moves. However, it’s a significant improvement.

Do you happen to know what the Q parameter is used for?

Thank you,
Asis

tommylight wrote:

Traj section in the ini file, velocities are much lower than in the display section, try setting those same as display section.

Hi MR.Tommy
"much lower than in the display section" Okay, I got it wrong. I think it's for the motor velocity. I will change it back to default.

Thank you,
Asis

I knew I wasn't crazy. Thanks for posting this!

I am at the very beginning of my LinuxCNC experience, and I don't know what I don't know. The only thing I know for sure is it isn't well documented.

Just a couple more files.These are extracted from the Maho Technical manual that you can download from one of my previous links to my Google Drive.
If you just want to remove the quill it's easy to flip the vertical head on it's side as shown. It eliminates the possibility of dropping the whole thing out accidentally.
I've edited the sketch to show a trap. Mine doesn't have the bolt setup for retaining the hand wheel assembly like Marks.I don't have the "U" shaped cover shown in Marks video. Mine has 3 separate plates instead. Under the left plate there is a a tapered dowel scotch key to retain the assembly. As you can see the instructions neither show or explains this. I've added the instruction in red. The machine has these tapered dowels in quite a few other places also.
It has the same travel limiting screw, but they only mention loosening it. Better to remove it completely since you don't know how loose to clear the quill. 5 mm maybe!
The quill clamp on mine is quite different. It can be clamped in any quill position, unlike Marks which is one tooth step on the quill rack. I think both work nicely.
The heating instruction is to remove the tool clamping mechanism.is here, but it might be wise to leave the limit screw in place before you do it. I pulled the whole lot out and heated it on the bench in the vise as previously noted.

Cheers,
David
 

if you can write a little bit in c - just make a one-liner custom component... something like


select THRESH values somewhere in between values you get in corresponding switch positions.
the resistor thing should work fine. i did that for 24-pos switch, though with stm32 adc (12bit?)..