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Old 06-21-2019, 05:59 AM   #26 (permalink)
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Other than preferably a metric set?
you got the idea

on the vfd, take the FLA of the motor, iirc you multiply it by 3/2 to get the single phase FLA, add a few for losses in the inverter and that's the input amperage of inverter you want

you're only using 2/3 of the input rectifier, and you're being significantly more violent to the capacitors on the DC bus of the inverter which is why you oversize the inverter

Last edited by [486]; 06-21-2019 at 06:00 AM.
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Old 06-21-2019, 04:43 PM   #27 (permalink)
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So, this gets more expensive.

KBC's localish location does not have the basic machine for the one I want, only the one that already has DROs and power feed installed. Yoinks.
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Old 06-22-2019, 06:06 AM   #28 (permalink)
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I don't know where you live but you're talking about driving to Bellingham. This beats the crap out of all the mill drills.

https://bellingham.craigslist.org/tl...909138162.html
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Old 06-22-2019, 07:58 AM   #29 (permalink)
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I don't know where you live but you're talking about driving to Bellingham. This beats the crap out of all the mill drills.

https://bellingham.craigslist.org/tl...909138162.html
DRO, ballscrews and power feeds is pretty fuckin' swanky

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Old 06-22-2019, 08:17 AM   #30 (permalink)
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I don't know where you live but you're talking about driving to Bellingham. This beats the crap out of all the mill drills.

https://bellingham.craigslist.org/tl...909138162.html
Looks pretty clean
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Old 06-22-2019, 08:32 AM   #31 (permalink)
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I don't know where you live but you're talking about driving to Bellingham. This beats the crap out of all the mill drills.

https://bellingham.craigslist.org/tl...909138162.html
Oooooooooo.
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Old 06-23-2019, 11:55 AM   #32 (permalink)
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Why not CNC? More of a learning curve.... but with both machines you still need to set up the part, and find your zero's. I can model up and make a program on Fusion 360 pretty darn quick......



If I had the space... I would be going to get this right now. I am sure my apartment complex would not appreciate me putting this in my garage right now...


https://www.ebay.com/itm/TREE-JOURNE...7e558efaa21600
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Old 06-23-2019, 12:53 PM   #33 (permalink)
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Why not CNC? More of a learning curve.... but with both machines you still need to set up the part, and find your zero's. I can model up and make a program on Fusion 360 pretty darn quick......
Because I have zero experience in that, and I don't think it makes as much sense for doing majority 1-off or random/small operations.
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Old 06-23-2019, 05:58 PM   #34 (permalink)
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Because I have zero experience in that, and I don't think it makes as much sense for doing majority 1-off or random/small operations.
If you ever have an itch... Download fusion 360 and play with some Cad sofware. It will greatly open your abilities.

Sure... it might be a one off for your build... but you do have a youtube channel. You build one, it works, then you have the file to make more quickly and easily then you can make more to sell....


I can do most CNC one off's quicker then I can manual mill. I also have very little experience with it at this point.
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Old 06-23-2019, 07:35 PM   #35 (permalink)
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Sure... it might be a one off for your build... but you do have a youtube channel. You build one, it works, then you have the file to make more quickly and easily then you can make more to sell....
Being in Canada means I'm not economically viable unless it's some truly 1-off part that doesn't fucking exist anywhere and can't be made locally.

Although with the Trudollar being so shit it is helping, since my $100 is only $60 US. But everyone in the US expects free shipping or maybe $15 at most, then they find out for me to send them something from Canada is going to be $100+, and it won't be there tomorrow, and they're outraged.

I looked at a CNC Plasma and walked away from it when I figured out that Ruffstuff can sell laser cut brackets for less, and there's zero IP that can't be infringed on. You make a worthwhile product, they (or anyone else) will just copy it. I'd expect the same for just about anything I'd whip off on the lathe or mill. Just look at NWF losing almost all their market share to knockoffs.

Oh yeah, and unless I quit my day job it means my lead times will vary from 2 days to 2 months depending on if I'm actually home.
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Old 06-23-2019, 11:23 PM   #36 (permalink)
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Yeah I'd avoid CNC for one off parts. I know some people are good at it, but there is a hell of a learning curve. I'd rather spend that time making chips the old fashioned way.
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Old 06-24-2019, 12:08 AM   #37 (permalink)
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Yeah I'd avoid CNC for one off parts. I know some people are good at it, but there is a hell of a learning curve. I'd rather spend that time making chips the old fashioned way.
To each their own. I love my mill/drill CNC. Everything I do is one off.

The question comes down to do you want to spend time CADing or fixturing. Anything with round in it is 100x easier on a CNC then breaking out the rotatory table. Profiling manually is difficult and repetitive. I have yet to figure out how to do compound curves manually. There is an art to layout and fixturing, that I appreciate, but I would much rather throw together a quick sketch and run the code.
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Old 06-24-2019, 12:52 AM   #38 (permalink)
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To each their own. I love my mill/drill CNC. Everything I do is one off.

The question comes down to do you want to spend time CADing or fixturing. Anything with round in it is 100x easier on a CNC then breaking out the rotatory table. Profiling manually is difficult and repetitive. I have yet to figure out how to do compound curves manually. There is an art to layout and fixturing, that I appreciate, but I would much rather throw together a quick sketch and run the code.
How many parts actually need compound curves? About every single part I've ever made can be broken down into straight sections, common angles, and circles...
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Old 06-24-2019, 08:06 AM   #39 (permalink)
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How many parts actually need compound curves? About every single part I've ever made can be broken down into straight sections, common angles, and circles...
I could see it if a guy is trying to machine something like an impeller. Otherwise it's as you said, the parts can be broken down into a series of straight cuts/angles/circles; this is especially true when trying to duplicate damaged/worn out old parts since normally the original was made as simple as possible (and if it's anything actually old it was likely on a manual or pattern/fixture automated machine that more or less has the same limitations).

With more recent stuff I think that convention goes out the window. Ever flatbiller has access to CNC and therefore adds stupid complications to the part simply because they can.

How about I'll buy a manual machine and if I need to go CNC I'll buy another?
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Old 06-24-2019, 12:24 PM   #40 (permalink)
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How many parts actually need compound curves? About every single part I've ever made can be broken down into straight sections, common angles, and circles...
In reality you are probably right, it is problem that comes up very often. It mainly comes up when engraving, though I have done some fans and impellers recently.

Most parts can be done manually. I bet good money I'm faster with my CAM then you are with your rotary table thought. Don't get me wrong, there is a real art to being an expert at fixturing. I love watching old guys figure out how to make a manual machine do all kinds of things never originally intended.

I except there is a place for both. Really 90% of the time, I use my mill as a glorified drill press. I could do bolt hols with a punch and a drill press, but I prefer to use the mill with its DRO or the CNC package.

I think the who point of people encouraging CNC was to say if you run across one, don't disregard it out of hand. It does simple well and is incredibly versatility.
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