ATC for the Bridgeport mill

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ATC for the Bridgeport mill

Postby Derek » Mon Jun 11, 2018 12:31 am

So being as I used the ATC on it’s first paying job I figured it would be a good time to show everyone what Terry and I have been up to.

Some history. I made an ATC for my Alliant mill many years ago and it’s been working like a champ ever since. It’s a traditional style rotating carousel where the entire carousel. moves.

I wanted an ATC for my Bridgeport and started making the parts. It was going to be exactly the same as The Alliant except it would hold 12 tools instead of 10. As I was machining a batch of my cylinder heads, manually changing tools, I realized that the ATC I had started on wasn’t going to be the best choice. That’s when I started thinking up the current changer which is basically a hand grabbing a tool and putting it in the spindle.

Terry was already working on the macro for the 12 place carousel changer and he and I started hashing out different ideas. I wanted to incorporate as much of the stuff I had made already and started cruising ebay for the rest. Everything went a lot smoother than I expected and most of the systems worked on the first revision.

The drawbar is based on Ray Livingstons stepper drawbar design. I've been using it for a few years now.It is kind of slow and I have plans on upgrading that as well as incorporating a torque sensing plate to really verify that it is tight. Currently we monitor the RPMs of the drawbar figuring when the drawbar stops turning it is tight. There are scenarios where I could see the stepper stalling before the tool is tight and a torque sensor would solve that.

All of the ATC sensors and outputs are being handled with a CNCroom UD1-U and has been working flawlessly. So far I have around 500 tool changes with it and I really couldn’t be happier with the dependability.


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Re: ATC for the Bridgeport mill

Postby Vmax549 » Mon Jun 11, 2018 1:12 am

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Re: ATC for the Bridgeport mill

Postby Derek » Mon Jun 11, 2018 1:19 am

I guess you tube embedding is broken. It worked in preview. Follow Terry's link
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Re: ATC for the Bridgeport mill

Postby Vmax549 » Mon Jun 11, 2018 3:56 pm

Just an extra note. ALL the parts for this ATC were built with a machine running UCCNC.

(;-) TP
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Re: ATC for the Bridgeport mill

Postby Robertspark » Mon Jun 11, 2018 6:12 pm

Hats off to you both that was or appears very complex to work out the geometry
Rob

Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
UC400eth, UC300eth, UCCNC v1.2105, Neuron Lite.
UCCNC v1.2105 Macro Manual
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Re: ATC for the Bridgeport mill

Postby Vmax549 » Mon Jun 11, 2018 8:55 pm

Derek did all the hard work. I just drank coffee and watched.

(;-) TP
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Re: ATC for the Bridgeport mill

Postby andrewbishop66 » Fri Jun 15, 2018 7:47 pm

Can I just ask how the knee is driven I have a similar conversion but the spindle is raised up and down so limited z travel

Thanks Andrew
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Re: ATC for the Bridgeport mill

Postby Derek » Fri Jun 15, 2018 8:27 pm

The bridgeport has a ball screw with a rotating nut and air assist. The Alliant just has a servo slapped onto the knee lift screw and air assist. I have 4:1 on the Alliant and it's been working for years and years.

Terry knows someone who is using the quill for the Z and the knee for tool offset positioning.
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Re: ATC for the Bridgeport mill

Postby andrewbishop66 » Fri Jun 15, 2018 8:38 pm

Thanks for that

andrew
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Re: ATC for the Bridgeport mill

Postby cncdrive » Fri Jun 15, 2018 9:33 pm

Andrew,

We make BF50 CNCs with similar construction as the Bridgeport.
What we use to lift the table is a 90° precise gearbox, I think it is made my Neugart and is not too cheap, in the 1000-1200 Euros price range if I recall, but it worth it's cost and a large ballscrew is driving the knee up and down. The upper Z axis we keep manual adjustable.
I'm adding some photos to this post.
Attachments
BF50.jpg
DSC00775.JPG
DSC00771.JPG
cncdrive
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