Hercus PC200 retrofit

I'm trying to decide on spindle drives vs. Servo spindle and need to know some technical details please?

Is it possible to continuously send square wave (step and direction) pulses to the spindle driver from an axis control output of the Masso, using M03, M04 and switched off by M05 instead of analogue 0-10v? This is to make it behave like a regular lathe spindle, from a servo driver instead of a dc motor driver.

Can I feed the RPM (single pulse per rev) from the spindle encoder to the Masso to monitor realtime rpm and for threading and have that adjust the frequency of the continuous square wave output to the spindle servo driver? The normal encoder connections will still need to go to the servo driver for positioning the spindle.

Or am I off the mark completely?

Cheers
 

masso-support

MASSO Support
Staff member
Yes we will have to control the spindle servo motor using STEP and DIRECTION signals, we will be updating the MASSO software to have two internal modes, one to run the spindle at high RPM and second will be the indexing mode where MASSO will automatically turn the spindle to the desired angle and stop the motor so that C axis can be used.
 

pinoy-cnc

Pinoy CNC
Quote from MASSO - Support on March 16, 2018, 8:11 am

Yes we will have to control the spindle servo motor using STEP and DIRECTION signals, we will be updating the MASSO software to have two internal modes, one to run the spindle at high RPM and second will be the indexing mode where MASSO will automatically turn the spindle to the desired angle and stop the motor so that C axis can be used.

Hi,

I am planning to buy another masso controller for my mini lathe with DMM DYN4 AC Servo Drive and DHT AC Servo Motor for the spindle also for C axis. My question is there any schematic on how to connect this DMM servo to masso.

Also i found this schematic on centroid acorn forum, one of the masso user post it.
 

masso-support

MASSO Support
Staff member
  1. Wire the DIR- & PUL- to -ve of MASSO's power supply.
  2. Connect PUL+ to Pin 2 on Spindle connector.
  3. Connect DIR+ to Pin 3 on Spindle connector.
  4. Please note that we have still to add the STEP & DIR spindle control to the software for the above to work.
 

masso-support

MASSO Support
Staff member
This takes encoder feedback and looks like its designed for positioning, do you want the DC motor to be able to lock into position or just get revolutions on the spindle?
 
I was going for both position as a c axis and velocity for lathe spindle. It was only going to be for testing but I have decided to just upgrade to a DMM servo. If tests were successful I would upgrade to servo, if not, just leave the dc motor as is for 2 axis lathe...

I spoke to you and Aaron Powter about it, and I couldn't find a reasonable power supply for that board, so even if I am unsuccessful getting c axis working, the DMM servo will be a better spindle power source for rpm requirements of carbide cutters.

After our discussion the other day, I have disassembled my spindle and am meeting a bearing specialist today to find high speed bearings to replace these ones. They are angular contact rollers already, but the front one (chuck end) was noisy and oiled not synthetic grease... don't know if that matters or not?

Do you have a link or resource for wiring techniques to reduce electrical noise or interference? I want to lay out my electrical cabinet but don't want to build in problems.

Cheers
 

masso-support

MASSO Support
Staff member
In that case DMM or any other servo will be a better option.

Wiring wise you dont need anything special, can you post some photos of the machine and where you plan to wire everything then we can plan the location of the drives etc.
 
There are 2 sections for electrical. The corner has a cover panel, originally for the transformer where I think I'll put the dc power supplies.

The rear hinged compartment will probably house the Masso, gecko drives etc.
 

masso-support

MASSO Support
Staff member
All the power supplies and servo motor drives should be in one enclosure away from MASSO. This way the high electrical noise devices will be isolated.
 
I disassembled the turret to see how it works. It has 2 x micro switch inside, one indexes tool 1 and the other will signal each tool. For lock condition, there is 2 locking pins and a third that is longer that contacts an electrically insulated copper plate inside to ground it. It unlocks by simply reversing the motor and locks by going forward until the spring loaded pins drop into the lock plate.
 
Lock signal.

The third lock pin is tapered to clear pass through the indexing holes to contact the copper plate. The copper plate is insulated by rubber washers and the pin grounds it.

The locking pins are spring loaded to allow the turret to turn forwards while the pins push outwards to find the indexing holes.
 

masso-support

MASSO Support
Staff member
That's good news, we can use the second switch signals to count the number of tools rotated. This is very similar to EMCO tool changer and the MASSO EMCO tool changer logic will work for this tool changer also.
 
Hi, I'm bench testing the g320x servo drive.

The step setting is on 1mm, but position shifts 2mm on machine position?

Also, with the axis setup to 255ppr and 1mm per rev, it only rotates the servo motor 1/12th of a rev with 1mm jog...? Is this a problem with the alpha software?
 

masso-support

MASSO Support
Staff member
Are you looking at X axis? The values on X axis will be displayed double what actually the axis travels as the controller works in diameter mode.
 
So it operates like a digital read-out set to read diameter (but in reverse)?

Shouldn't it still read 1mm on the screen but only move the tool half value? That's what a DRO does.
 

masso-support

MASSO Support
Staff member
Its like if you are 10mm from the chuck centre then the actual job size will be 20mm diameter. So when you enter a gcode for X axis to machine a part 30mm dia G1 X30 then the actual movement on the X axis will be 15mm.
 
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