Advice on Old mill retrofit? + tool type

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05 Dec 2018 17:46 #121892 by simonmn
Hey guys!

I have been lucky to pick up an old Bridgeport Interact 308 CNC milling machine. I haven't gotten it home yet, so this might be a little premature posting, but I am just so exited.

It has a Heidenhein TNC 2500 controller, but both the seller and me suspect the parameters to be lost on the dead batteries. Its not really a big deal for me, since I am planning on a linuxcnc retrofit.

I am also working on a old Mazak cnc lathe with linuxcnc, which is coming along nicely... slowly, but nicely.

For you guys with experience with retrofitting old machinery, could you give me some advice on the best approach on this project?
It would be nice to be able use the old servo motors and drives. But if I have to, or it would save "time", I am prepared to get new motors plus drives. The ATC is also a big priority for me.

The thing I am a little worried about, is the documentation. The seller had a book with him, but it was more of a maintenance book for what I could see. It had some basic information about the machine, constructional diagrams over the major components, and some electrical diagrams and so on. But compared to the documentation from my mazak, its not more than a flier.

Some question that pops up in my quick research is: Different types of BT 30 Taper toolholders?

The "Flier" says it uses MAS403 tool holders, and MAS407-1 pull studs.
Now then I search for those, it gets generalized as BT/CT/JIB/MAS tool holders.

Me being really optimistic, hopes this means I can purchase BT30 toolholders, and use them without damaging the spindle. :blush:
But is that so? And what about the pull stud? I hope it isn't like Mazak machines, which use proprietary pull studs, but I have to admit, I have no clue. :side:

I hope you guys could help me, and give me some advice.
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06 Dec 2018 17:40 #121971 by andypugh

simonmn wrote: For you guys with experience with retrofitting old machinery, could you give me some advice on the best approach on this project?
It would be nice to be able use the old servo motors and drives. But if I have to, or it would save "time", I am prepared to get new motors plus drives. The ATC is also a big priority for me.

I would keep them if I could.


The "Flier" says it uses MAS403 tool holders, and MAS407-1 pull studs.
Now then I search for those, it gets generalized as BT/CT/JIB/MAS tool holders.

Me being really optimistic, hopes this means I can purchase BT30 toolholders, and use them without damaging the spindle.


As I understand it MAS403 _means_ BT30.
407-1 is 45 degree pull stud, (2 is 60 degree, 3 is 90 degree) www.vtool.ru/sht.htm

All the 7/24 tapers are compatible. My mill was supplied as 30INT, but I fitted a BT30 drawbar for pulls studs and then used BT30 holders. Then I found a cheap job-lot of SK30 holders, and shortened one drive lug to suit.
I have a couple of ISO30 tapping chucks, I am going to re-thread one (for my horizontal axis) and cut the thread off the other and fit a pull-stud for the vertical.
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08 Dec 2018 10:36 #122047 by simonmn
Thanks for the advice!
Is there a "easy" way to find the correct settings for the servos if the parameters are missing? It will be my first time working with servo motors.

I have made an order for a BT30 tool taper, and a type 1 pull stud (45 degree) today.

As for electronics, I was planning on using a Mesa 7i76e again, as I do on my lathe. Will this be enough in terms of inputs, and motion control?

Again thanks for your help
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08 Dec 2018 11:17 #122048 by andypugh

simonmn wrote: Thanks for the advice!
Is there a "easy" way to find the correct settings for the servos if the parameters are missing? It will be my first time working with servo motors.

Not really, it always comes down to trial, error, and tuning even when you have full documentation.

As for electronics, I was planning on using a Mesa 7i76e again, as I do on my lathe. Will this be enough in terms of inputs, and motion control?

Possibly not the best choice for a servo machine if the drives require +/-10V analogue control,
I would figure out the drive control scheme and encoder types before deciding on a motion control card.
You might find that something like 7i93 + 7i33TA is a better fit, or 7i92 + 7i77 if you want to use Ethernet. But it is also worth looking at the PCI cards (6i24 + 7i33 ++). If the machine has resolvers then you definitely need to be looking at the 50-pin header cards + 7i49.
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