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Tool clamp signal going off during cycle on Mori seiki MH1000

Had a good problem that I chased my tail on the other week.  When the program was running occasionally the machine would alarm out with "tool not clamped". The machine was a Mori Seiki MH1000. I checked the typical prox switch on the back of the unclamp cylinder to make sure it was back which is the only clamp confirmation signal for this machine. I was able to see that it was not back all the way one time during the process. I tried taking a pry bar and to pull the cylinder back and it moved about a 1/8 inch.

Alarm on Hitachi can be tripped by breaker only, but breaker was not tripped.


Hitachi Generic alarm generated.

The alarm that was being generated had no description at all. On this particular Hitachi machine tool you must look at the diagnostic addresses on the Fanuc side which will tell you the alarmed bit. On this machine I had an alarm that could only be generated from a breaker trip circuit according to the electrical prints. However when the alarm occurred the breaker did not trip. I looked at what was in this breakers circuit and found that it was for multiple things. Air cooler exchange fans, cabinet fans, machine light and several other things.

Добро пожаловать в русскозычный блог специалистов по ЧПУ.

This blog is welcomed for all specialists involved in design, building, retrofiting and servicing CNC controls and drives in russian Federation. 

Блог специалистов по системам ЧПУ. Добро пожаловать разработчикам систем ЧПУ, приводов, всем, кто занимается модернизацией, ремонтом и техническим обслуживанием.

Предпочтительный язык русский, английский и немецкий также не возбранются, хотя и не поощряются. Пожалуйста, отвечайте на языке того лица, которому отвечаете. 

Circular interpolation milling has divots in axis quadrants or reversal using G02 and G03 commands

When machining a part using Circular interpolation machine problems can be found.  CNC programming for circular interpolation often uses G02, and G03 for example. Sometimes you can find in the holes that are circular interpolated the parts have slight divots in the quadrants for a particular axis as I found on a recent job. What I found in this scenario was that the ballscrew nut had lost  its preload and had excessive backlash. This type of backlash can not be taken out by a parameter to remove the dimple/divot.

Axis drop preventer for all types of CNC machines (at the time of power failure)

Having tool brakage or job damage during POWER FAILURE?

ANSWER: Axis drop preventer.

We manufacture AXIS DROP PREVENTER FOR ALL TYPES OF CNC MACHINES which will prevent the vertical axis from dropping during power failure minimizing the loss and increase in production
The accuracy of our unit is <20 microns
Contact: 097414 97292

OKK HM4 spindle replacement

This is a brief description of OKK HM4 spindle replacement. This OKK HM4 spindle is a simple inline cartridge style design.The spindle was fairly easy to replace and would be a great job for a newbie to take on. Below is a brief summary of how to begin this task.

Z axis not repeating on a vertical machining center

Had a job that I went into today that the customer complained about Z axis varying by 1/16 to 1/8 after a lightening strike. They were running castings and taking mill cuts across the top. This depth seemed to be changing. My immediate thoughts were an encoder problem since that's typicql if the encoder does not read all the pulses.

Hitachi door to stop spindle from turning when opened-safety issues

Had a customer request making a Hitachi HG400 machine safer and have the spindle stop when the side door opens. I have noticed many Hitachi machines set up this way and had looked into how to make this safer. What I found was a simple easy change that could be made. I traced through the ladder and found  Par 11-0 could be changed to automatically stop the spindle. This had to be changed on the Micon side through the small CRT screen on the side of the electrical cabinet. If there is no switch at all on your machine it may also be added.

Ways to learn and find people with your interests and hobbies

I know this topic is sort of unrelated. But what I have found may interest you in a lot of repects. This weekend I attended something called a barcamp. What it was was a community of web developers and people that enjoy what they do and get together for some brainstorming. The weekend event that I attended was great, completly free and was sponsored by adobe. They supplied food and beverages  for the entire weekend. The people speaking and giving the seminars were not paid a dime and enjoyed doing it for they learned from everyone as well.

Mitsubishi M64 control Corrupt user program memory symptoms

Symptoms of program memory needing to be formated which occured on Mitsubishi M64 control. This happened on Mori seiki GV-503 CNC machine with a meldas 64. Customer said a DOS screen appeared on Bootup once or twice with “ diagnostic code 005 Enter. As well as analyzing data.

What type of coolant skimmer do you prefer?

Zimmerman CNC machine with lubrication alarm

Had a problem the other day with a Zimmerman bridge type CNC machine tool. The machine utilized a grease lubrication system for it's linear guides and ballscrews. The Zimmerman had a lubrication alarm that came on after about 15 seconds after the alarm is cleared.

Machine does not tool change due to ATC 2nd reference postion out of work envelope on Mitsubishi M3 control

Had a problem on Mitsubishi machine H-5A. When commanding a tool change the tool was called up and placed above the spindle. However the ATC did not exchange the tools and came up with a YZ not at 2nd reference return alarm. The position in the screen had a #2 next to them so they were in fact at 2nd reference. The machine had a Mitsubishi M3 control on it. On this control someone had changed the Zero return position and 2nd reference position. However there is also a fail safe in the control. to prevent excessive changes and keep the zero return within the factory envelope.

All Axis Over Travel - FANUC OM

Upon power-up of my Kitamura MyCenter 1 all axis show over travel limit error in the minus direction. The axis are not on limit switches, in fact they are all closer to the plus switches. With this error the axis will only move plus.. I have checked the panel and all switches seem to be fine. Also all limit switches seem to be ok. Does anyone have another suggestion?

VF1 Spindle

I would like to rebuild the spindle in my VF1 myself. Has anyone done this before?

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