Dyna 2400 Mill update NOT DIALUP FRIENDLY!

[Alex_Cole]

Well, I think I found that this issue I was having with the Z axis was not noise but the servo driver itself. I am going to pull the driver card so we can try to track down what is wrong with it. In the meantime I have ordered a Gecko G320 to test with to see how it drives the Z axis of this machine compared to the drives we have put together. I will get some pictures as time allows and report the results of our tests.

AC

[Alex_Cole]

How did my thread end up in this "Knee Mills section. It is a benchtop mill with no knee? I started it in Benchtop mills? How did it get here?

Anyone?

[woodturn]

I just got stock to mill up some new mounts for my 269 oz in steppers. Hopfully we will have this thing up and running my the end on the year. It is like one step foward two back around here.
dave

[Roger Lewis]

Hi Alex. This is awsome to see what you are doing. I bought a 2400 a few years back and never did much with it. Fired it up a few times and shut it off then used it for a dust magnet. I finally have a need to get it running and now I see what you are doing. You just cut my work down to almost nothing. THANKS! My machine is in excellent shape with very low usage. I only had two problems while playing with it. First is one of those Delrin gears broke and the controller that came with it would error out on random occasions. The first was an easy fix, the second is why I never used it and wanted to convert it. I do have a question for you. Do you know what kind of backlash you have? I want to use mine for circuit boards as well as regular machining and low backlash is an issue. Hope to be in touch as this moves along. Keep up the good work!

[Alex_Cole]

Rodger

It is going to depend on how yours is setup. If you look at the pictures in my post you will see one of the Z axis backlash nut. If yours is of this type then it is adjustable. I have not done a major ammount of work in getting this dialed in yet as I am still working on the z axis driver issue right now but on my X axis using my digital indicator I have been getting a consistant reposition of .0005. I tested the Z axis just the week before last and I am getting the same results with it.

These machines are built well if you have one that has the same construction as mine. Some have a little spring loaded nut that isn't really adjustable. For units with that type of nut I cannot comment about as I am unfamiluar with them. With my unit and the ones like it from what I gather they are supposed to be able to have a repeatablility of somthing crazy like .0002 in there origional configuration.

I will try to help with what I can. Just post any questions you may have and some one will most likely be able to help.

AC

[ScottC]

Hi guys, just finished the control upgrade on my dyna 2400 and am setting up mach 3. Could anyone suggest the correct proceedure for removing backlash from the x and y axis on the 2400?

Ive had the table apart to check the ways etc and noticed on the screw nut a large hex bolt, is this used to control backlash? Anyone know how much load i should put on the nuts at the end of the screws?

Scott

[woodturn]

Sorry, I have the plastic spring loaded type. So I have no idea.
dave

[Alex_Cole]

At this point I have adjusted the nuts at the end of my screws until there was no linear movement anymore but also not so tight that it created major resistance on the rotation of the screw. If you have them too tight I figure you will wear out the thrust bearings pretty quick. As for the backlash screw on the block I used my indicator and adjusted this screw until there was no backlash but again not so tight that it made it too hard to turn the screw.


HTH
AC

[kel1]

Hey Guys,

Does anyone know what the original spindle motor transformer was rated for on the 2400? Mine did not come with any electronics(just the 80vdc motor with snipped off wires) at all so we wound one from an old transformer. When testing to figure out the DC voltage to achieve 10000 rpm (at the spindle) with a Variac and a tach we came up with 55 volts AC converted to DC with a rectifier circuit gave us 10000 rpm. We built the transformer to put out about 3 amps.
I was wondering if anybody has the original specs to see if we are close or not.
Another question I had was when the spindle is under load or cutting conditions does the spindle motor rpm decrease much or does it have a circuit of some kind to keep it at a constant rpm continuously? With the transformer and rectifier circuit we made the rpms do drop somewhat under heavy loads.We also made a speed controller that works but we blew one transistor so far. It has been replaced and added a larger heatsink for the transistor but havent tried it again yet and we are not sure why it blew yet ??

Any info would be appreciated. I am just learning electronics basics from a friend so this is all new to me but very interesting.

Thanks Kel

[ScottC]

Hey Kel,

I converted my mill from 110v to 240v. One thing i did was replace the spindle control and powersupply. I puchased an all in one unit that basically plugs into the exisiting wiring loom. Its called a whisperdrive, can look up the product code on monday. It lets me input either 110 or 240v and has trim pots that let you control heaps of things like ramp in and ramp out, speed control, auxilary relay switching from the pc, spindle lock and overload protection. I also have the exisiting spindle driver board lying around

Scott

[Alex_Cole]

My spindle will bog under load. Sorry I don't have much time today guys but just wanted to let you know.

AC

[kel1]

Originally Posted by ScottC Hey Kel, I converted my mill from 110v to 240v. One thing i did was replace the spindle control and powersupply. I puchased an all in one unit that basically plugs into the exisiting wiring loom. Its called a whisperdrive, can look up the product code on monday. It lets me input either 110 or 240v and has trim pots that let you control heaps of things like ramp in and ramp out, speed control, auxilary relay switching from the pc, spindle lock and overload protection. I also have the exisiting spindle driver board lying around Scott

Your "whisperdrive" sounds interesting. Do you have a link to it ? Was the original spindle driver board not adequate enough ?