BTC clubhouse!#*$!

[sprintcar72]

Hello all,
I just brought home BTC-1 serial number 175. I’m not new to Bridgeports, but I am new to this head. Can anyone explain how spindle speeds are obtained? I realize there is a VFD, but are there three ratios? The motor nameplate lists three RPMs. What happens in the shoebox? And like everyone else, I would love to get my hands on a set of manuals, or at least the service manual. All of the previous links pointing to manuals result in dead ends now. I have access to an industrial grade scanner, so I would gladly scan in and make available to everyone.
Thanks,
Mike




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[HunterBTC1]

Hello all,
I just brought home BTC-1 serial number 175. I’m not new to Bridgeports, but I am new to this head. Can anyone explain how spindle speeds are obtained? I realize there is a VFD, but are there three ratios? The motor nameplate lists three RPMs. What happens in the shoebox? And like everyone else, I would love to get my hands on a set of manuals, or at least the service manual. All of the previous links pointing to manuals result in dead ends now. I have access to an industrial grade scanner, so I would gladly scan in and make available to everyone.
Thanks,
Mike




Sent from my iPad using Tapatalk

I just bought oldcarguy85's linuxcnc retrofitted btc1. I would also love a manual for it. I am trying my best to reverse engineer it at the moment. I think that box just indicated if the spindle is in low, neutral, or high speed. The three rpms on thee motor are the speeds at 3 different operating frequencies. The last one 5000rpm is at like 172hz, not 60 hz.

[HunterBTC1]

Here are some pictures of the machine I purchased a few months ago. Continuing to work on it, just figured out a problem with the lock bar. If anyone has any documentation please let me know! https://photos.app.goo.gl/gXBEVYJNcvcbrvvM7

[servtech]

Here are some pictures of the machine I purchased a few months ago. Continuing to work on it, just figured out a problem with the lock bar. If anyone has any documentation please let me know! https://photos.app.goo.gl/gXBEVYJNcvcbrvvM7

Full of admiration you have a running machine. Decades old tech ????

[HunterBTC1]

I found a little bit of documentation on the BTC-1! Someone with two of them was nice enough to send me some photos of the manuals.

I have a copy of all the pages on my website, and I'll keep adding to it if I find more.

https://hunterwlong.com/documentatio...hining-center/

[Kevin Taylor]

Usually all gear change problem's are in the shoe box or the ground plane Do You have a maintenance manual ? Mostly problem's with the switches moved by the cam on the back gear shaft

[Punchdigitizing699]

Hey Kevin, great to connect! Custom embroidery digitizing is quite the adventure, isn't it? Hunting for those TG100 holders feels like a quest for hidden gems. Keep refining your search, and you'll uncover exactly what you need. As for eBay, decoding those descriptions is like solving a puzzle.