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Thread: PM-45 CNC Conversion (RF45)

  1. #441
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    I haven't got into carbide aluminum specific endmills yet as the spindle isn't fast enough to use them right now. But I plan on moving to them after the belt drive conversion.

    No plans for an ATC. Just need to finish the belt drive and power drawbar, and get flood cooling going and I'll be done with building parts for the machine. That's not my focus, I have tons of things I've designed and have in my head that I need to starting building!

    PM-45 CNC conversion built/run/sold.


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    I plumbed the air cylinder for the drawbar the other night and found a leak. When Air is routed To the bottom of the cylinder to retract it leaks out around the bottom of the piston. It seems like it should not, and that the normal condition would be with air supplied to the retract side. Then the air switch when pushed would divert air to the extend side while depressed only, then return to retract when released.

    Is this correct or is the retract not a sealed area.

    PM-45 CNC conversion built/run/sold.


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    I am pretty sure it should hold air in both directions. That is the way mine works. As with yours my normal condition is air pressure in the lower section holding the piston in the up position.

    Kelly
    www.finescale360.com


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    Does sound like you have a bad seal at the shaft. It should hold air in both directions. Good thing is Fabco's are easy to disassemble & you shouldn't have a problem getting a new seal for it.



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    Normally the air to retrack the cylinder goes into the middle port, extend goes in the top port, and the bottom port has a screen.

    Non rotating cylinders have a hex bushing in the bottom and do not have a seal around the rod.

    Richard



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    Quote Originally Posted by jid2 View Post
    I haven't got into carbide aluminum specific endmills yet as the spindle isn't fast enough to use them right now. But I plan on moving to them after the belt drive conversion.

    No plans for an ATC. Just need to finish the belt drive and power drawbar, and get flood cooling going and I'll be done with building parts for the machine. That's not my focus, I have tons of things I've designed and have in my head that I need to starting building!
    you'd be amazed at what they can do with what speeds your mill can achieve now. Its the geometry that gets you. You can get some serious cuts and material removal rates with them. I was using them on a round column RF30 clone that could only do around 2k on the spindle and I was doing a .25" wide cut that was .145" deep and I couldn't move the table fast enough. I think I found the limit at about .400" deep and 0.250" wide for that machine. And that was with totally dry. I was pushing it a bit for sure, but comparing it to a regular 4flute carbide bit I had for doing steel its night and day.



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    Quote Originally Posted by rwskinner View Post
    Normally the air to retrack the cylinder goes into the middle port, extend goes in the top port, and the bottom port has a screen.

    Non rotating cylinders have a hex bushing in the bottom and do not have a seal around the rod.

    Richard
    This sounds like mine with the hex bushing, I'll try the middle port. Thanks for the tip Richard.

    Sortafast - what brand tools are you using? Seems that Maritool, Lakeshore Carbide,and Swift are the ones I'm looking at. Swift is local to me which is a nice option.

    PM-45 CNC conversion built/run/sold.


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    I was checking to see how that center port worked out for you. I ran into the same thing on my multistage cylinder. I looked up the info on the fabco site and found I plumbed into the wrong port for the retract.

    Richard



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    ^^^ Waiting for fittings to arrive on Monday.

    PM-45 CNC conversion built/run/sold.


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    Interesting,

    I hadn't paid much attention to the pictures of the cylinder other than noticing it was a Fabco. Mine is a Fabco 3 Stage, but only has two ports, 1 at the top & 1 at the bottom.

    Certainly there's many different models, so hope that is a quick & easy fix for you. Good call Richard, should do the trick!



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    Moved retract to the center port and everything works like it should. No leaks. I tried two sizes of air switches and the mini one which uses 10-32 fittings is slower but way easier to package.

    I made my 2nd motor mounting side plate today, now I just need to remake that first one that I screwed up. Then I just need to turn pulleys and top hats to finish the belt drive parts.

    PM-45 CNC conversion built/run/sold.


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    Awesome! I'm glad you got that sorted out.

    Richard



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    Ordered some carbide tooling from Maritool in prep for the belt drive to someday be finished.

    I also ordered a Fogbuster system from Tormach, I want something better than me and WD40 but fear flood is going to be a slow painful process to do correctly. Fogbuster seems like the best near dry system.

    PM-45 CNC conversion built/run/sold.


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    Do you have a link or part number? I hadn't seen it there.

    Richard

    Quote Originally Posted by jid2 View Post

    I also ordered a Fogbuster system from Tormach, I want something better than me and WD40 but fear flood is going to be a slow painful process to do correctly. Fogbuster seems like the best near dry system.




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    PM-45 CNC conversion built/run/sold.


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    Got these things all fit together.



    PM-45 CNC conversion built/run/sold.


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    OK, now I need some guidance on cutting the v grooves in the pulleys. What has everyone else been doing? I saw Jermie used a 60 degree cutter at .079" depth at the .092" spacing.

    Below are pictures of my first pass at testing that out and it looked OK, but didn't seem to grab as tight as you would want.

    I also found this drawing which I think is more correct and uses a 40 degree tool, which I think I would need to grind from HSS, unless someone knows a source for an insert?









    PM-45 CNC conversion built/run/sold.


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    Boy, that sure doesn't look deep enough to me, it only looks half the depth. I used a 40 degree also. The flats across the tops look almost twice to wide. I hate to ask, but are you sure you went 0.071" deep per side?

    Richard



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    Quote Originally Posted by rwskinner View Post
    Boy, that sure doesn't look deep enough to me, it only looks half the depth. I used a 40 degree also. The flats across the tops look almost twice to wide. I hate to ask, but are you sure you went 0.071" deep per side?

    Richard
    Haha! You are totally right, I did do .071 total, not on the radius - I suck on the Lathe. I just read through yours, and Gary's who both used the 40 degree HSS self-grind special. I guess I will need to grind my first tool.

    PM-45 CNC conversion built/run/sold.


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