Re: CNC and Phase converter

#19908

If it worked fine before, it's possible one of the capacitors in the static converter has died.

Re: CNC and Phase converter

#19907

I am not an authority on this subject but I just purchased a used Bridgeport that is coming with a variable frequency drive (VFD) so I can run the 2hp 3 ph motor from 230 single phase. Seems a lot cleaner option than a phase converter and they are under $300.

Re: CNC and Phase converter

#19906

First ten years I had no problem, so it is the Converter that is bad/broken? What should I replace it with? Thanks.

Re: Bridgeport correct colour for 1985 machine

#19905

Hi Marty,

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That's a mighty fine looking lathe, do love a lathe. I have a Southbend 9" 1938 vintage and a Colchester (Clausing to you I think) Master 2500, blooming love it.

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I think i am going to just rub down the existing paint, fill the chips and then paint over the top, probably absolute sacrilege but I have seen the horror stories your talking about with oil constantly coming out of the castings into the primer and I want to actually use the machine before hell freezes over!

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Thank you again for your advice.?

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BTW how are things going with your Lagun Mill?

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Re: CNC and Phase converter

#19904

The static phase converter is your problem.

Yes, i have tried them. I repaired Bridgeport heads in my garage and needed to run them.?

George Wroclawski
Service Manager
McDaniel Machinery Inc.
Mobile : 1-205-937-2066

Show quoted text

On Mon, Mar 24, 2025, 6:40?PM seb fontana via <speedoo51=[email protected]> wrote:

I error, motor is 3hp, 3 ph, 7.8 max amps full load. Converter is static. Phase-A-Matic, model PAM600. 3 to 5hp, 15.2 amps.? 1990 machine. I got it in 2005 [when I got the phase converter]. Never worked machine very hard,? Thanks.

Re: CNC and Phase converter

#19903

I error, motor is 3hp, 3 ph, 7.8 max amps full load. Converter is static. Phase-A-Matic, model PAM600. 3 to 5hp, 15.2 amps.? 1990 machine. I got it in 2005 [when I got the phase converter]. Never worked machine very hard,? Thanks.

Re: CNC and Phase converter

#19902

You do not say if your phase converter is a rotary type or a static type. We also need to know what it is rated for. Sounds like it is either the static type or it is too small. Without having a meter with memory to retrieve the high and low reading, you will need to rely on the given specifications of the machine and phase converter? to figure this out.

On Sunday, March 23, 2025 at 02:30:35 PM CDT, seb fontana via groups.io <speedoo51@...> wrote:

I have a CNC machine with 2hp, 3 Phase? 220v motor. I am using a 220v 1 to 3 phase converter. Some times when I turn motor on it will cause the cnc control to go into fault and lose position. I assume its some type of voltage or amp spike but don't know how to check. The motor gets power from the main panel [220v welder line] while the 110v cnc control is powered through remote 220v service panel that supplies the garage.?

CNC and Phase converter

#19901

I have a CNC machine with 2hp, 3 Phase? 220v motor. I am using a 220v 1 to 3 phase converter. Some times when I turn motor on it will cause the cnc control to go into fault and lose position. I assume its some type of voltage or amp spike but don't know how to check. The motor gets power from the main panel [220v welder line] while the 110v cnc control is powered through remote 220v service panel that supplies the garage.?

Re: Using a servo motor as a power feed

#19900

BOY , I am beyond out of touch for this issue.

The photos are a bit deceptive. The MOTOR hides behind the controller . In the Y Axis drive on the web site's mill , it's invisible. Much like a few modern Automobile engines , hiding the fuel pump UNDERNEATH the intake manifold , basically within the engine .

At least the motor wouldn't be knocked off by a passing FORKLIFT that way. ?

But these drives and motors I briefly saw online

range between $250 - $800 dollars just for the components, often in used condition.

Some things I could see the investment for updating some of the original Bridgeport power feeds that might already be in place.

But it makes simply wearing out $200 dollar or less Asian Power feed seem might appealing.

Again I had simply " Made Do " for quite some time on my Home machine. Though a proper and correct Lead screw was acquired for the TYPICAL aftermarket power feed drive.?

I don't even want to elaborate on the "In The Meantime "? adapter I'd made for this power feed 25 years ago.? Why ?

The original? monstrous Cast Iron GEARBOX power feed was BROKEN off. ( and missing )?

I'd bet by a Forklift. ?. And the SCREW was BENT.

Yes I straightened the SCREW and and sectioned in parts of an end shaft to fit. Separating the brass nut and making everything function together.?

I'd made an analogy now decades ago.

That's the SIGNPOST UP AHEAD.....your next stop -The Twilight Zone - .

From my favorite author Richard Matheson's story

, *STEEL* . The battered and badly obsolete Android Boxer? " Battlin' Maxo " .

Virtually every single component that PROTRUDED in anyway from the overall mass of the machine had been bent , broken or mangled. Which meant replaced in some fashion. Almost invariably with some creation of the "Installer 's" imagination.

If maybe more like LACK thereof !???! ?

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Re: Using a servo motor as a power feed

#19899

Over the last decade (or more) many folk have demonstrated that various affordable standard "90 volt dc motor" driver boards make perfectly satisfactory replacements for both Bridgeport 6F / 8F integrated driver boards and the UK Erskine controllers. So, given a sound motor, unobtanioum / unrepairable electronics isn't a major issue. Last time I looked the costs of recon exchange - send away for repair - standard driver board were all pretty similar in the UK.

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The extra gubbins hanging down off the end of the table is a potential issue if space constrained but the clearance region needed doesn't appear vastly greater than with a standard DC motor set up. I'd be unsurprised to discover it wants less room than the old style 3 phase motors and gearbox units. Obviously not ideal, especially as the belt covering casting assembly it all hangs on seems a bit on the flimsy side. If a major worry it might ell be possible to re-engineer things so the motor lies along the front of the table. Need to find another home for the control panel though.

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The one question that isn't addressed is whether the unit comes complete with some sort of mechanical clutch enabling hand feeding of the table if so desired. Obviously you will need to arrange your own carrier for the handle and dial assembly but including some sort of dog clutch to swop between power and hand feed could be bit too much work.

Re: Using a servo motor as a power feed

#19898

I tend to agree with Clive's observations, in that this product description is generally mirroring the functions available on standard offerings. I haven't looked at the pricing of these (clearly, from the translation, Chinese) power feed and controller setups, but it seems that there is likely some additional liability in the unit as pictured. Mainly, the controller box, also containing the motor, hanging out and down looks to me like a magnet for collisions with traffic around the machine. If the mounting plate that joins the box to the table is not substantial, it could be damaged in case of a meet-up with a speeding employee or material cart. More so, I would think, the controller enclosure may also be subject to similar damage. It may very well be possible to configure the system to have the controller electronics protected in a remote location, but that's a sort of partial solution.

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On the other hand, if support for the electronics is "good", whatever that might mean today, perhaps they can be a viable replacement in the scarcity situation that always accompanies the BPort/Erskine controller boards.

Re: Using a servo motor as a power feed

#19897

Technically the industry standard "90 volt nominal" dc motors used on the 6F and 8F power feeds as well as the Erskine controlled versions fitted to UK (Adcock Shipley) built machines are servo motors. It's the speed stabilised drivers that make them so. Albeit not in particularly sophisticated way but perfectly adequate for the feed drive job. Any of the open market control boards are up for that job. Affordable care just fine.

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The one referenced to is just an all in one set up functionally similar to the 6F, 8F and aftermarket Servo (or copy) installations. Just belt drive rather than direct on the end of the feed screw. On anther part of the web site the firm also offer naked motor with separate controller systems which would have to be installed similarly to the UK Erskine based systems with the drive board in the electrical cabinet.

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What I'd really like is something able to piggyback onto my DRO readout to stop the feed when the axis gets down to zero. Tappitty-tap-tap on the keypad is much easier than setting a stop switch just so. The guy who mentioned the standard stop bar and lever set up can go an stand in the corner.

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Clive

Re: Using a servo motor as a power feed

#19896

开云体育

rotary encoder??

Cliff Rohrabacher Esq.

--

Sent with Tutanota; enjoy secure & ad-free emails:

Mar 22, 2025, 6:24 PM by nzkiwishooter@...:

Show quoted text

Is there anyone using a servo motor as a powerfeed motor?
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I came across this online and thought it would be quite innovative and the system could be used on multiple types of machines
?

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Does anyone know of a controller for a servo motor to enable it to be used as a power feed motor?
?
Thanks

Using a servo motor as a power feed

#19895

Is there anyone using a servo motor as a powerfeed motor?

?

I came across this online and thought it would be quite innovative and the system could be used on multiple types of machines

?

Does anyone know of a controller for a servo motor to enable it to be used as a power feed motor?

?

Thanks

Re: Bridgeport Mill Motor Voltages

#19894

On My machine I had to go inside the motor to access the 12 wires to change the voltage .

?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? Joe.

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On Saturday, 22 March 2025 at 02:50:52 GMT, Mike Irion via groups.io <mikeirion@...> wrote:

Thanks for all the input, thankfully it is a dual voltage 230/460 3ph winding, here is my motor name plate......

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Re: Bridgeport Mill Motor Voltages

#19893

Thanks for all the input, thankfully it is a dual voltage 230/460 3ph winding, here is my motor name plate......

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Re: Bridgeport Mill Motor Voltages

#19891

开云体育

The main motor can be converted on most machines, but if that isn't the case for this machine, you can get an external 230VAC to 460VAC transformer to convert (or vice versa). It is an extra expense, but not a disaster.? For a 2HP machine, you can find them for less than $500 USD, even cheaper used.

You need to size the transformer. E.g. I bought a 7kVA 3 phase for my 3 axis CNC knee mill (3HP motor along with the CNC controller, motors, etc.). It was oversized, but I got it cheap used. A larger (oversized) transformer is OK.

You can search for calculators to help, but a quick search showed me the following:
2hp, with a 0.8 power factor = 1.86 kVA

Note, kVA is not kW. KVA takes into account the power factor of your motor. Based on this, I would go with a 3kVA to 5kVA or larger transformer just to be sure (e.g. 2hp at 0.5 power factor is 2.98kVA, or you might find out the new machine actually has a 3HP motor which is 2.8kVA at 0.8 power factor). I bought a 7kVA for my CNC knee mill. A larger transformer doesn't hurt anything. Just cost. Your electrician should be able to confirm these numbers.?

You mentioned going from 230V 1 phase to 3 phase. What ever you use for that may be able to convert voltages too (e.g. if you buy a solid state converter maybe). But more likely you want 230VAC 1ph in and 230VAC 3ph out, so you would use a 3ph 230-460VAC transformer after the phase inverter. The transformer draws a little power, and may affect the phase converter due to power factor and/or loading, so take that into account when sizing and buying a phase inverter.? I need to do this in my own shop now because I moved to a place with only 1ph power. I plan to discuss this with the phase inverter manufacturer to be sure all is OK (it should be).

FYI, these transformers have multiple taps to convert from 208-240VAC to/from 440-480VAC. Plus you should research delta vs. wye to make sure if it matters for your situation before buying. Again there are many resources to help figure this out. Some transformers go delta to wye only, but some I believe can do both using different taps.?

Of course, knowing what the machine is would be nice, but when buying machines, I never worried about this as the solution is always just a transformer away from being solved. My biggest machine was a german 5 axis CNC mill that needed 380VAC at 50A, but it came with a transformer that converted any voltage (220 or 480) to 380V, so I never had to worry.?

Regards,
Michael

___________________________________________________________________
Michael Lohmeyer
mike@...

On 3/21/25 1:58 PM, George Wroclawski via groups.io wrote:

Show quoted text

All of the ones I installed could be configured for 220 3 phase or 460 3 phase.

George Wroclawski
Service Manager
McDaniel Machinery Inc.

On Fri, Mar 21, 2025, 1:38?PM mikeirion via <mikeirion=[email protected]> wrote:

I am in the process of buying a used 2J2 mill with a 2 hp motor. I am presently waiting for a snapshot of the motor nameplate from the dealer but I am getting curious/nervous while I wait. An electrician told me today that he has run into machinery motors that are only wound for 460 V 3 Ph and I planned on running it with 230v 1 Ph and a VFD. Can anyone tell me if the Bridgeports are typically capable of being connected to 230 or 460 3 Ph as I have seen on most industrial motors. Thanks, Mike

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Re: Bridgeport Mill Motor Voltages

#19890

Here is my conversion to a 240V VFD in Australia.?

Re: Bridgeport Mill Motor Voltages

#19889

All of the ones I installed could be configured for 220 3 phase or 460 3 phase.

George Wroclawski
Service Manager
McDaniel Machinery Inc.

Show quoted text

On Fri, Mar 21, 2025, 1:38?PM mikeirion via <mikeirion=[email protected]> wrote:

I am in the process of buying a used 2J2 mill with a 2 hp motor. I am presently waiting for a snapshot of the motor nameplate from the dealer but I am getting curious/nervous while I wait. An electrician told me today that he has run into machinery motors that are only wound for 460 V 3 Ph and I planned on running it with 230v 1 Ph and a VFD. Can anyone tell me if the Bridgeports are typically capable of being connected to 230 or 460 3 Ph as I have seen on most industrial motors. Thanks, Mike

?

Bridgeport Mill Motor Voltages

#19888

I am in the process of buying a used 2J2 mill with a 2 hp motor. I am presently waiting for a snapshot of the motor nameplate from the dealer but I am getting curious/nervous while I wait. An electrician told me today that he has run into machinery motors that are only wound for 460 V 3 Ph and I planned on running it with 230v 1 Ph and a VFD. Can anyone tell me if the Bridgeports are typically capable of being connected to 230 or 460 3 Ph as I have seen on most industrial motors. Thanks, Mike

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