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Thinking of getting a CNC mill, tell me about the bridgeport series 1 interacts

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stvy:
Hi,

Well after doing some research on the series 1 and series 2 I have come to the conclusion that unless I can find an amazing deal the series 1 MK II is what I am looking for. Reason being the Series 2 is just too heavy for me to deal with. I could well regret that later but for the time being that is my decision.

I have been reading up on the TNC 2500 controllers. So as far as I can tell they are not going to give me much that would hold off a linuxcnc or mach3 conversion compared to a 151B. There do seem to be quite a few Series 1 MK II with TNC2500 controllers for sale. However the asking price is approximately 5 times my budget. Which leads me to the question does anyone have the specification of the DC servo motors for the Series 1 MK II? I need to look at the option of buying a none working or partially working example with the plan for fixing it. Any good sources for affordable replacement modern DC Servos? Same for the ballscrews? and spindle  DC servo drive motor?

Thanks,
Steve

Muzzerboy:
If you mean DC servo as in brushed DC motors, there aren't many to be found as most servos are brushless these days.

For a DC brushed servo drive, perhaps a DuGong DG4S would work? http://cncdrive.com/DG4S_16035.html

These are 35A and up to 160V, although you really need a braking module to absorb decel energy. These seem to be pretty good value for money. I just received one this week (they come from Hungary) so it's too soon to comment on their performance. They take a step/dir input and require an encoder on the motor. They look reasonably well made and I'm guessing this is their 4th generation product. The tuning software looks pretty reasonable too.

AdeV:
Used servomotors actually come up fairly frequently on eBay, as I found when I needed one (of course, at the time I actually needed one, there was only one, in the USA, and it cost the thick end of £600 to get it to the UK...). They usually sell for between £200 and £400. If you can wait, the cheaper ones are probably just fine. I've only ever seen one main motor come up, and I bought that.... IIRC it cost £500. Or thereabouts.... I forget now. It's sitting in storage just in case mine ever goes pop.

I'll ask my mate to look out for a machine as well, he's a machine mover by trade, so is often carting lumps of mill or lathe around the country, if he sees a Mk2 being scrapped/sold cheap, I'll get him to let me know & I can pass it on. Unfortunately, he's not a cheap guy to hire, but he is damn good at his job...

stvy:
On the Series 1 MK II, it seems so far all of the pictures I can find show that the top of the knees are chromed.  :hammer: Can't scrape chrome.... So it needs to be in reasonable shape. Although a diamond stone and wearing the good parts down to the same level of wear as the worst of it would work.

Are there any other bearing surfaces that are chromed? Top of the saddle?

Also how is the lubrication on these? The manual Series 1 take a lot of wear if the lubrations get blocked. Which they easily do.

Thanks,
Steve

AdeV:
Lube oil is supplied from a tank on the back of the machine. It's pumped onto the ways whenever the spindle is running. If it runs out, the machine throws an error - although, weirdly, the error it displays is "loss of 24v supply".... cue much cursing and disassembling/reassembling the 24v supply circuit, before realising it just needed topping up with oil. Don't ask me how I know this, how many times I rebuilt the 24v regulator circuit, or how long the machine was out of commission before I realised what the actual problem was....

I'm fairly sure mine has scraping marks on the saddle ways (not sure about the knee ways), I'll check at the weekend when I'm next down at the workshop (no time during the week).

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