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Bridgeport did not publish motor specs to my knowledge, but the service manuals and build commissioning sheet lists electrical tuning parameters when the machine shipped out. I have all the old...

I just checked the catalogs & machine in question.The X&Y use Sigma E42HXLC, rated at 2698 oz-in +/- 10% holding torque @ 7.4 amps phase current. The label on the motor indicates the winding are...

I'm still running my D6's on the BOSS 5, set to 10 microsteps per full step. Rebuilt the controls cabinet last year and now it contains 5 of the Slo-Syn 2000-D6s (rotary axis and knee axis were...

Typically the Z is the limiting axis in terms of speed and acceleration, but I see quite a bit less difference than you. Possibly you have mechanical issues, the ball screw assembly and quill should...

Yes, it would be like 12 amps parallel. In fact the original steppers on the Boss 5 are 2 stack units rated 10.6 amps parallel, (7.5 amps unipolar) and made by Sigma. The 3 stack Sigma units I'm...

Your fundamental problem is not the existing NEMA 42 motors, rather the driver (Gecko) which only runs off 80V DC max. I don't know how you have it wired now, but essentially you don't have the...

I am also trying to find a magnetic keyboard overlay for the Heidenhain 150 / 151 / 155 series. I emailed Heidenhain support and was told they are no longer available. So I'm wondering if anybody on...

Looks like some early version Series 2 BOSS rigid ram castings judging from the column - knee - table, as well as the MDI control pannel, but the rest of the head casting sure does look very strang....

Why do you say there is no interest in the machine? Is it listed / shown somewhere?

Thank for that perspective. My Boss 5 shoowed the 70005 boot error (upon purchase), and I could not get past it, so I ended up ditching the controls altogether and using Mach3. I also now own 2 Boss...

HawkJet:
Thanks for the kind words. I'll let you know of anything I discover once I find time to play around with the original motors and the DSP controlled drive. That may be a few weeks.

HawkJET:
I was composing my response during the time you posted, so did not get to read it till afterwards. Composing the response took more than an hour, as I was also still doing other things....

They are Ohms law, and Faraday's law. Physics 101. The definition of magnetomotive force is N x i, where N is the number of turns of the conductor the magnetic flux is cutting across, as it either...

[QUOTE=HawkJET;1436454]I agree with all the points you are making, and have not attempted to counter them. The difference I see is that you and I are using the same information to solve different...

No, we are not on the same page at all. Both series and parallel wiring uses all the copper in the motor, while unipolar uses only half the copper, at any one instant in time when the motor is...

HawkJET
It is basically a center-tapped coil and from center-tap to one end gives one polarity and center-tap to the other end gives opposite polarity. With a bipolar drive you can use all the...

Yes, slo-syn ss2000d6 (Superior Electric, now Danaher). Compumotor (Parker) made compareable drives, the s6. The PAC-Sci stuff is expensive, and I have not yet scored a deal on such. I'm guessing it...

HAWKjet:
The higher voltage gives a much faster rise time to the magnetic field, so that is where the increased "ringing" probably originates from, even if the current only rises to 6 amps and stays...

I have original Catalogs from Superior Slo-Syn (1979) and Sigma Instruments (1984). They list the available stepper motors, and from measuring the winding resistance, it is rather clear which models...

They are being run with the windings in series at 6 amps. Each winding will see half the bus voltage. Because of switch losses through the half bridge, and similar drops, the DC bus will be very...

What wiring harness? It has screw terminals for the motor, and they usually they come with a plug-in screw terminal adaptor for the controls side. If this last item was removed, it is a $15 dollar...

The SS-D6 is rated at 7 amps, and it contains an 8 amp fuse. There is alot of reactive power (poor power factor) in these drives. I have my 3 units all tied together on a 15 amp circuit and have...

I have a few different Bridgeport BOSS mills. Stock motors are Sigma 20-4270D (double stack) with about 1300 oz-in holding torque , around 1000 running. I bolted some 21-4288D (3 stack) rated for...

Right now I'm running the SS-D6, they are fine, older tech, but bulletproof. The compumotor S6 & S8 are more advanced, with extra tuneable damping features. I just ordered a DM2280 to play with. I...

You don't need a power supply, the stepper drivers of this style simply use 120 AC input. You can search ebay for used name brand American drives, like Pacific Scientific, Superior Slo Syn,...

120 AC gets rectified to ~ 170DC minus losses, so effective 160 volts available at the DC bus. This is what you need, choose the KL-11080, forget all the other stuff. Use the half-current function to...

You'd be spending your money in the wrong place. The original motors put out plenty if you feed them at the proper DC bus voltage and amperage. You should see 140 IPM with a 6 amp driver backed by a...

The Keling driver is only good for 90 volts DC max, with your windings connected in series to provide the needed amperage for each, that would only be 45 volts per winding. I don't know what you are...

You are welcome. Glad to see the progress. I can tell from the video that there is problem within your spindle drive, it should much quieter. I suspect worn bushings. Rebuild kits are available at...

Set steps according to the 2000 steps per rev configuration line in the table. The motors are 200 step/rev X 10 microsteps/step = 2000 microsteps/rev.