Hello to all,'hope bussiness is good.Here we go,I have a VH65 rotab with a dead Glentek 4020 motor,broken magnet.Fadal wants to sell me a new motor for about 1800.00 and the same thing will happen again,as these motors are crap.Glentek's position is that its a fadal and thats your problem.
A dc servo is a dc servo,if the specs from one manufacturer to another are the same,they should be interchangeable.That being said,foremetioned glentek crap was replaced with a Baldor MT4060.Same specs,built better,it has seals,orings a varnished magnet structure and new its about 600.00.I bought this one on Ebay for 100.
The motor require a step turned on the face and 4 holes drilled and tapped in the front and two 8-32 holes drilled in the back to mount the resolver.Done.All mounted up and plugged in.The motor hunts for postion.Back and forth.
Fadal and Glentek matched the original 4020 motor and Ga 4568a amp.There is almost no adjustment to the bandwith,tach gain and the position loop gain is pot adjustable but fixed with resistors.We added the comp adjustment and the tach gain-still hunts.There is a non Fadal version that has considreable adjustment.
This is where Im at.We are sooooo close to breaking the Glentek hold.The postion loop gain is to low,the motor is to soft.The gain needs to be increased by adding a bigger resistor in front of the amp itself.We have no schematic.Any one know anything about this amp in detail?
Pulling this off will allow you to use ANY mfg's motor on a Fadal on any axis,as all the amps are set.Ill share all the info with everybody if we can pull this off-'need your help.
One more thing,most of us own old,or "cheap" cnc equipment,we get raped for the parts,charging what the market will bear is BULL****.All of us at one point or more have come up with an alternative part or solution.If I put a FREE website up listing all this kinda stuff,would you all contribute?Here's your first beat the man-own a Matsurra with agear driven head?tried to find the "Schaun" motor drive puck? $300. from Methods-made by American Vulcan in Winterhaven FL-$60.00-your turn.....I need your help with the Glentek amp.