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    Help. Difference in power feeds?

    Thanks for your reply it has helped me out. I think the unit on my Chinese Bridgeport which is 20 years old has a stuffed potentiometer as it makes very little difference to the speed and the red indicator light doesn’t work but I my pull it apart and have a look before buying a new one. Cheers Stu.
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    Help. Difference in power feeds?

    Hi all and thanks for reading. In a nutshell I’m looking on Feebay for a replacement X axis power feed. There seems to be a choice of two units, both made in China. The first is about $210 and the second is around $450. Both units list the same specifications and have the same control layout and...
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    Sparky’s help needed. VFD won’t hold motor relay on. Milling machine.

    Hi and thanks MSKJ. That’s just the info I needed, clear, concise and easy to understand. I’ve already started sketching out a new control box for the whole machine. The main controls are down on the knee which I don’t like and they have seen better days so this will give me the chance to...
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    Sparky’s help needed. VFD won’t hold motor relay on. Milling machine.

    Hi guys, I have a new to me Chinese Bridgeport that I just purchased at auction. The listing said the machine had been tested and worked as it should. It has a 1.5hp three phase motor so I connected a 3hp VFD straight to the original power cable. The coolant pump, light and power feed all work...
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    OZ25-ISO30 Collet. I need your help because I’m lost.

    Hallelujah the cavalry has arrived. Hi guys, thanks so much for all the help. eKretz hit the nail on the head for a dummy like me. When I got the machine the collet wrench had a piece of pipe on the end of it which I had removed. After I read all the replies this morning I understood what was...
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    OZ25-ISO30 Collet. I need your help because I’m lost.

    Hi all, I purchased a used Chinese Bridgeport and I haven’t used collets before. I removed the collet holder out of the spindle but this is when the trouble began. My holder has OZ25-ISO30 written on it. I’m not sure what this means because I believe that the OZ25 and the ISO30 are two different...
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    What is this thread size? Trying to repairing a bench grinder spindle

    Hi Ian, did you resolve the problem. I’ll put money on it being UNF probably 9/16- 12. Be careful if there is play in the threads as I believe it may also be Whitworth. I found an 8” grinder in a skip a few weeks ago and took it home and repaired it. When trying to find a LH nut, I measured the...
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    Help with inverting air over hydraulic jack to work upside down.

    Hey Dave, that makes sense but I’ll read it a couple of time to make sure it sinks in. “I’m not a smart man”. I have cut up the frame of the jack so I can use the original reservoir. Less work than making a new one. One thing I’m not sure about is the return line. Do you mean the return line...
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    Help with inverting air over hydraulic jack to work upside down.

    Here is a picture of a similar jack. I admit it would have been better to add this to my original post. There was no link in my post but I did have this sentence near the bottom of the post saying: Please see the YT video listed above to see how the jack is constructed and what I am trying to...
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    Help with inverting air over hydraulic jack to work upside down.

    Not quite sure what you’re talking about. Its air over hydraulic so the air drives the hydraulic pump. Once I had it working again it lifted my truck no problem using 120psi.
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    Help with inverting air over hydraulic jack to work upside down.

    Thanks Digger Doug and DaveKamp, this is no simple bottle jack with an air motor connected to it. I already have manual bottle jack working quite well upside down. That’s why I left a link to the YT video. I think if you have a quick look at the video you will see this unit is made quite...
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    Help with inverting air over hydraulic jack to work upside down.

    Hi Illinoyance, I used to have a press that worked that way and I hate them. I find that there is to much play in the ram for me and what I do. I have a 20Ton press with a modified jack that works upside down but the air over hydraulic would be a lot more convenient. I tried the ram inverted...
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    Help with inverting air over hydraulic jack to work upside down.

    Hi all, I have two AC hydraulic 10/20 ton jacks the same style as shown on YouTube (how to repair your 65T air hydraulic jack. By AC Hydraulics) that were replaced in our workshop due to failing. I have one working again but it won’t be put back in service for lifting so I want to use it in a...
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