Airsmiths on MCB MCB Airsmiths working together to bring you the best in custom paintball work.

Thread Tools Search this Thread
Old 04-10-2019, 10:16 PM   #1 (permalink)
MCB Member
Join Date: May 2014
Location: Illinois

Bridgeport Textron motor options 3 phase to 1 phase VFD rewind or replace

Curious what the best options are. Starting the long expensive process of a CNC retrofit, at least starting on something that was CNC to start with, albeit an ancient Bridgeport knee mill. All electronics have been removed and are getting replaced.

Basically the guts of a series 1 with varispeed and a backgear. Only quirk is the motor shaft faces up so it does limit motor length.

Do I just get a new 220v motor, have my 3 phase rewound, get a DC motor? Any point to having a variable speed motor with a varispeed drive? Any advantages to keeping the 3 phase motor with the VFD vs a 220v motor? I've heard the VFD's don't last.

Current motor is in good running condition.
theangrydragon is offline   Reply With Quote
Old 04-23-2019, 12:29 AM   #2 (permalink)
MCB Member
Join Date: May 2014
Location: Illinois

Thinking since the motors good I'm just going the VFD route so I can start throwing chips asap.

So what VFD should I get? It's a Bridgeport 2hp motor 208v.

Last edited by theangrydragon; 04-23-2019 at 12:33 AM.
theangrydragon is offline   Reply With Quote
Old 04-23-2019, 01:00 AM   #3 (permalink)
MCB Member
Join Date: Apr 2006

I've been running my 1hp bridgeport with a teco vfd with no problems so far. I liked the convenience of changing speeds with a dial so much I threw a 3 phase motor and vfd on my lathe.

kit is offline   Reply With Quote
Old 04-23-2019, 01:55 AM   #4 (permalink)
Heart of Texas
cave_hero's Avatar
Join Date: Jun 2007
Location: Central texas

SMV Vector by AC Tech looks to be a good one.
MCB feedback

Need money? I buy old eclipse splash stuff..
cave_hero is offline   Reply With Quote
Old 04-23-2019, 02:16 PM   #5 (permalink)
Mad Science of Paintball
DocsMachine's Avatar
Join Date: Jul 2011

I've been running VFDs for over a decade now, and to be honest, at this point they're preferable over single phase.

I have something like nine or ten in total, although not all of them are hooked up at the moment. The Logan lathe and Exacto mill both have 2HP WEG VFDs, the horizontal bandsaw and the belt grinder have KB Electronics ones (the enclosed, dust-proof ones popular with the knife grinders) the horizontal mill, gearhead drill press, Sheldon lathe and the vertical bandsaw all have Automation Direct VFDs (plus I think I have another for the Rockwell grinder) plus a giant 10HP Polyspede that will go on the big lathe once that's back up and running.

The only failures I've ever had, were last year, the AC Tech unit that came with my Sheldon when I bought it in 2008, finally croaked. According to the receipts I got with the lathe, the previous owner had probably bought it in 2003 or so, meaning it lasted some 15 years- and as you can imagine, I used it pretty hard for the last decade.

I'd have simply replaced it with another AC Tech, but at the time, all the dealers I could find were out of stock on the 3HP model, so I bought a 3HP Automation Direct.

The only other failure I had was with the Logan CNC conversion- apparently my controller didn't like the signal connections to the VFD and something popped internally. The VFD still functions just fine, it just will no longer accept remote-input signals. You have to use the onboard controls.

That was an Automation Direct unit, and I swapped it with a WEG I had laying around.

There is absolutely nothing wrong with those original Bridgeport motors (barring, of course, problems with that particular motor, like bad bearings or having been overheated, etc.) I'd have no qualms with slapping a 2HP AD VFD on that machine, wiring the factory start/stop switch to it, and goin' to town.

If you're doing a CNC conversion, you can easily connect it to most typical controllers and let it start and stop the spindle, and vary the speed within a limited range. Most controllers will give you an option of "ranges" too, so if you tell it "high range", you'll manually move the Vari-Drive to top speed, if you tell it "mid range" you'll have to manually dial it down, etc.

But apart from that, you can let the VFD and whatever CNC controller you're using, set the actual RPM.

Doc's Machine. Fixing, fiddling and transmogrifying markers since 1998.
The Whiteboard. Vaguely paintball-related webcomic absurdity every weekday!
Doc's Online Store! Doc's eBay Store!
The Definitive Guide to Paintball in the Movies!
DocsMachine is offline   Reply With Quote
Reply » Custom » Airsmiths on MCB

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

All times are GMT -4. The time now is 08:37 AM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO
© MCB Network LLC