Ordering Avid Pro CNC - Page 3 - Router Forums
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post #21 of 217 (permalink) Old 07-27-2019, 12:41 PM
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I would get the 3kW over the 2.2kW. I doubt there's more than a couple of amps difference in what they pull and there's just something about MORE POWER that I love!!! :-)

David
I'm all for bigger if there's a benefit to it but if you can cut 3/4" birch at 150imp single pass with a 2.2kw and nema23 motors, I really don't see the need to spend the extra $$$
Unless you're running a cabinet shop.

https://youtu.be/7qgmGYUwK0M
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post #22 of 217 (permalink) Old 07-27-2019, 02:15 PM Thread Starter
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I'm all for bigger if there's a benefit to it but if you can cut 3/4" birch at 150imp single pass with a 2.2kw and nema23 motors, I really don't see the need to spend the extra $$$
Unless you're running a cabinet shop.

https://youtu.be/7qgmGYUwK0M
I was going to build it with Nema 34 . I read thereís less chances of having missteps etc with the larger steppers .
Ideally Iíd go with Servos, but thatís out of my budget

I donít always insulate , but when I do .
Ok ,I never insulate
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post #23 of 217 (permalink) Old 07-27-2019, 02:20 PM
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Sounds good although the only missteps I've had is when I've ran it into the bumpers during a bit change. (Yep, I'm too cheap to splurge on the $260 limit switches) 😉

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post #24 of 217 (permalink) Old 07-27-2019, 03:02 PM
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Sounds good although the only missteps I've had is when I've ran it into the bumpers during a bit change. (Yep, I'm to cheap to splurge on the $260 limit switches) 😉
On my present machine (self-designed and built), I'm using the high-priced Pepperl & Fuchs. However, on my first machine, I used the $18 for 5 Chinese cheapies.

Here's what I found:

Chinese are just as repeatable as P&F
P&F have a greater sensing distance
In a bypass (vs head on) sensing application, P&F pick up the target sooner
To maximize the Sensing distance with the Chinese, you have get the 18mm sensors (8mm sensing on steel) vs P&F, which are 12mm with 8mm sensing distance (about 1/4" dia. thinner). (I used the 18mm Chinese).

The P&F may last longer, but I do not have empirical evidence of that. In two years of use, the Chinese sensors never failed. I mechanically squared the gantry to the sensors. With the Chinese, homing on Y/slave axis was spot on every time.

Bottom line: IMO, cost is not an excuse for going bare.

Gary
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post #25 of 217 (permalink) Old 07-27-2019, 03:11 PM
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I was going to build it with Nema 34 . I read thereís less chances of having missteps etc with the larger steppers .
Ideally Iíd go with Servos, but thatís out of my budget

I went with the NEMA 34s. No complaints. I suspect that if NEMA 23s were losing steps, there would likely be a mechanical issue somewhere, e.g., the linear rails not parallel, the table not coplanar and level., etc.

If you are familiar with the Saturn 2 welded steel machines, there are folks successfully pushing the much heavier gantry with NEMA 23s.

I like a beefier machine, so I use the 34s. That's just me, though.

Gary
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post #26 of 217 (permalink) Old 07-27-2019, 03:36 PM
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Originally Posted by Pro4824 View Post
I'm all for bigger if there's a benefit to it but if you can cut 3/4" birch at 150imp single pass with a 2.2kw and nema23 motors, I really don't see the need to spend the extra $$$
Unless you're running a cabinet shop.
In our cabinet shop, we cut at 1200ipm with a 15HP spindle.


If you make the same cut at 300-400ipm, you'll double your tool life.
Also, a more powerful spindle will be cutting at a lower percentage of it's abilities, so it *should* last longer than a smaller spindle doing the same work.
I consider round chinese spindles to be disposable, so it's a minor issue.
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post #27 of 217 (permalink) Old 07-27-2019, 04:53 PM Thread Starter
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In our cabinet shop, we cut at 1200ipm with a 15HP spindle.


If you make the same cut at 300-400ipm, you'll double your tool life.
Also, a more powerful spindle will be cutting at a lower percentage of it's abilities, so it *should* last longer than a smaller spindle doing the same work.
I consider round chinese spindles to be disposable, so it's a minor issue.
I’m trying to keep it one phase here lol, but I get your point

I donít always insulate , but when I do .
Ok ,I never insulate

Last edited by RainMan 2.0; 07-27-2019 at 04:55 PM.
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post #28 of 217 (permalink) Old 07-27-2019, 06:18 PM
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I've been running mine for a couple of years and only crashed maybe twice so I'll probably keep running it without sensors but it would be nice to finally get to click that ref all home button! 🙂
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post #29 of 217 (permalink) Old 07-28-2019, 02:43 PM Thread Starter
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I’m trying to keep it one phase here lol, but I get your point
lol, I done goofed with this response , as the VDF converts single phase to 3 phase I believe.

I’m dam near tempting to go with Avids VDF and spindle , but it sure seems pricey compared to other options.
But I guess you get what you pay for. I keep hearing about bearing failure with Chinese spindles , and I’m doubting the bearings are something you can change out yourself ?

I donít always insulate , but when I do .
Ok ,I never insulate

Last edited by RainMan 2.0; 07-28-2019 at 02:47 PM.
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post #30 of 217 (permalink) Old 07-28-2019, 03:00 PM
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I got one of each. There is a marked difference.
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I took the tests and retirement is the best job I'm suited for.

Now I know why old guys wear suspenders.
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