Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442431
01/28/18 08:45 PM
01/28/18 08:45 PM
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Joined: Sep 2003
Posts: 2,175 Duloc
The Shadow
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,175
Duloc
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442443
01/28/18 09:04 PM
01/28/18 09:04 PM
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Joined: Jan 2003
Posts: 4,334 Morrow, OH
markz528
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master
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Posts: 4,334
Morrow, OH
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Hands down - VFD. You want the variable speed and the braking capability of the VFD.
Foe mine, I replaced the original 1 hp motor with a 3 hp aluminum frame motor. I think I paid around $250 for the motor. I went with the 3 hp to make up for lost torque because I went with a single pulley - this way no more changing belt position to get a wide range of speed. Leave it in a high speed position and use the VFD to lower the speed.
You have a few options for braking with a VFD. The best solution is to use a dynamic braking resistor. I use DC injection - not as good but is decent and easier to implement.
Don't plan on listening to AM radio when the VFD is on................
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Guys with Bridgeports at Home
[Re: PC-CHARGER]
#2442451
01/28/18 09:14 PM
01/28/18 09:14 PM
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Joined: Jan 2003
Posts: 4,334 Morrow, OH
markz528
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Posts: 4,334
Morrow, OH
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VFD but it must connect directly to the motor, no contacters.
That's not really true. If the drive is closely rated to the motor size, then the drive will trip on over-current if you close the contactor when the drive is on. If the drive is oversized, then closing the contactor while the drive is on won't hurt a thing. Neither the motor or drive would care, but in a single motor application like this it does not make sense to do this. For example, my surface grinder spindle is a 1 hp motor. The coolant pump is 1/6 hp. I run both off of a single 1 hp drive (I don't exceed the drive rated amps). I slam the coolant pump on/off at will with a contactor when the drive is running the spindle. Works absolutely fine. The trick is the drive must be able to provide the inrush current and the drive needs to be set up in volts/hertz mode. For a mill you prefer sensorless vector mode because you don't lose torque at low speeds like you do in volts/hertz mode. No issues if you don't run in volts/hertz mode at low speeds. My mill is volts/hertz (so old it don't have sensorless vector mode) and I can stall the motor at very low speeds.
Last edited by markz528; 01/28/18 09:15 PM.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442460
01/28/18 09:24 PM
01/28/18 09:24 PM
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Joined: Jan 2003
Posts: 26,529 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 26,529
Rio Linda, CA
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Changed the motor to single phase.
The INTERNET, the MISinformation superhighway
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442462
01/28/18 09:25 PM
01/28/18 09:25 PM
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Joined: Jan 2003
Posts: 7,526 Minnesota
Hemi_Joel
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master
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Posts: 7,526
Minnesota
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I built a rotary phase converter for under $20 using cast off parts that I scrounged: a 5 horse 3 phase motor for the converter, a 1/2 horse 110 motor to start the converter motor spinning, and then bought 2 pulleys and a belt to connect them.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442463
01/28/18 09:28 PM
01/28/18 09:28 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Milwaukee WI
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I’ve used the phase-a-matic converters in the past. I would get 2 to 3 years out of them. Fixed one a few times. Finally went with a rotary phase converter. Machines run much smoother, and reversing on demand works perfectly. No comparison between the two on performance.
"use it 'till it breaks, replace as needed"
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442514
01/28/18 10:39 PM
01/28/18 10:39 PM
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Joined: Jan 2003
Posts: 5,765 Hot Rod Ridge
FastmOp
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master
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Posts: 5,765
Hot Rod Ridge
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I use a static converter on my Bridgeport. No issues.
I use a rotary on my CNC.
Last edited by FastmOp; 01/29/18 05:11 AM.
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442525
01/28/18 11:06 PM
01/28/18 11:06 PM
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Joined: Jan 2003
Posts: 4,334 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,334
Morrow, OH
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A little bit of rewiring and Steff will be fine! A little birdie told me.............
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442573
01/29/18 12:22 AM
01/29/18 12:22 AM
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Joined: Jan 2004
Posts: 8,653 fredericksburg,va
cudaman1969
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Posts: 8,653
fredericksburg,va
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I want one so BAD, hate to hijack but, I have a 50 hp Roto-Phase converter for my other 3 ph machines, so am I good to go? You guys are talking way over my head. PS. I want one I can put an engine block in.
Last edited by cudaman1969; 01/29/18 12:24 AM.
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442588
01/29/18 12:42 AM
01/29/18 12:42 AM
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Joined: Jan 2004
Posts: 4,633 Motor City
6PKRTSE
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master
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Posts: 4,633
Motor City
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We have 12 of bridgeport and other brand Mills at work. I can use any of them when I need to but I still want one for at home someday along with a nice lathe.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Guys with Bridgeports at Home
[Re: cudaman1969]
#2442642
01/29/18 01:42 AM
01/29/18 01:42 AM
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Joined: Jan 2003
Posts: 5,765 Hot Rod Ridge
FastmOp
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master
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Hot Rod Ridge
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I want one so BAD, hate to hijack but, I have a 50 hp Roto-Phase converter for my other 3 ph machines, so am I good to go? You guys are talking way over my head. PS. I want one I can put an engine block in. Your good to go for anything with a motor size up to 25 HP
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Re: Guys with Bridgeports at Home
[Re: Sport440]
#2442689
01/29/18 02:54 AM
01/29/18 02:54 AM
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Joined: Jan 2003
Posts: 4,334 Morrow, OH
markz528
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master
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Morrow, OH
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A little bit of rewiring and Steff will be fine! A little birdie told me............. What kind of rewiring are we talking about here. Id be interested to know? He got it running temporarily. He was turning it on through the original switch which is on the motor leads. Since he has a 2 hp drive with a 2 hp motor (nothing wrong with that) you can't switch the motor onto the drive. He needs to wire the motor directly to the drive and then either put a small toggle switch in to run the drive or rewire the existing switch into the drive controls to stop/start and fwd/rev.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Guys with Bridgeports at Home
[Re: Jerry]
#2442835
01/29/18 12:59 PM
01/29/18 12:59 PM
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Joined: Jan 2003
Posts: 3,887 Smyrna, South Carolina
STEFF
OP
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OP
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Posts: 3,887
Smyrna, South Carolina
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you can't rewire 3 phase to single phase. if you've already got the motor rewound for 240 vs 480, the either a static or rotary phase converter will work. heck even a vfd set at 60hz will work as well, just way overkill for what you're trying to do.
my vote would be a rotary phase converter and get one large enough to support all your machines and a compressor. Yep, my rewind is 3 phase. The VFD I got was $112 on Ebay. Overkill but cheap.
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2442988
01/29/18 06:22 PM
01/29/18 06:22 PM
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Joined: Jan 2003
Posts: 4,334 Morrow, OH
markz528
master
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master
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Posts: 4,334
Morrow, OH
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What I neglected to tell Steff is that he probably would have been just fine not rewinding the motor.
My original Bridgeport from 1966 came with a 1 hp motor. Later ones had a 2 hp (I believe).
Since his motor was 480 volt at 2 hp, he could of run it up to 240 volts (linear voltage ramp from 0 to 240 volts and varying the frequency from 0 to 30 hertz) in constant torque mode up to 50% speed and then constant hp mode from 50 to 100% speed (fixed 240 volts but vary the frequency from 31 to 60 hertz).
What does that mean? It means that he would have had rated hp up to 50% speed, but from 50% to 100% speed he would have been limited to 1 hp output. I don't think he ever would have had a problem being limited to 1 hp at the higher speeds.
But too late now!
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Guys with Bridgeports at Home
[Re: STEFF]
#2443017
01/29/18 07:25 PM
01/29/18 07:25 PM
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Superfreak
Unregistered
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Superfreak
Unregistered
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What are you guys doing to contain the coolant when milling?
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