Matt's X3 build Odyssey......

[Matt McColley]

Did you REMOVE the table and saddle to clean under them?

Saving that task for now.....

Once I have it off the floor on it's stand, I intend to go through the ArcEurotrades machine prep. guide, sans spindle disassembly.

I'm going to invest a good bit of time with the ways and gibbs. I have a plan to use my new class B granite slab, some double sided tape and 400 and 600 grit emery paper to get the ways perfectly flat and to polish them up nicely.

I'm having fun with the stand design for now....

Ordered these casters on Friday.......

http://news.thomasnet.com/pdf/31207.pdf

I can get the 220 lbs. ones through work for only $10.50/ea (delivered!)

Will post stand desing when I get further along with it.

[Teyber12]

for better or for worse..... I'm going to try the G540 and 387 oz. NEMA 23 steppers on all three axis.....

Attachment 77777

cart/stand design is next....

stay tuned....

nice!

are you going to put a gas strut on the head?

[Matt McColley]

plan is to counter weight all but ~30 lbs. of the head with a pully and cable system.....

BUT............

now I'm having second thoughts (again).......

If I understand correctly, there is not currently a N34 size motor out there that will run optimally with the G540 due to the voltage limitations of the driver.

But, is there a N34 frame motor that, when run "sub-optimally" at 48 VDC will perform better than my current selection, the 387 oz KL23H284-35-4B?

If I'm going to jump ship on my Z axis motor...... sooner is better than later....

[Crevice Reamer]

plan is to counter weight all but ~30 lbs. of the head with a pully and cable system.....

BUT............

now I'm having second thoughts (again).......

If I understand correctly, there is not currently a N34 size motor out there that will run optimally with the G540 due to the voltage limitations of the driver.

But, is there a N34 frame motor that, when run "sub-optimally" at 48 VDC will perform better than my current selection, the 387 oz KL23H284-35-4B?

If I'm going to jump ship on my Z axis motor...... sooner is better than later....

This is something I am ALWAYS on the lookout for--and have not found yet.

The closest I have come is the $99 KL34H295-43-8A from Keling. It is a 906 oz, 58V motor that, when detuned from 6.1A to 3.5A will still crank out 520 oz of torque.

Now that's not 640 oz, but with some counterweight or a gas strut this just might do it. You would need a 1/2 inch pulley. Maybe Michael would swap you one.

Another possibility would be to use this motor with a slightly smaller drive pulley and alter the ratio to 1.2 to 1. That would give 640 oz power and still a fairly good Z rapid speed. Michael has done some experimenting with this and probably knows what pulley to use.

You know, this may just BE the X3/G540/N34 answer for now!!!!

CR.

[Matt McColley]

when detuned from 6.1A to 3.5A

can you please help me understand what you mean by "detuned"???

[Crevice Reamer]

can you please help me understand what you mean by "detuned"???

Sure! Detuning is a concept from Auto manufacturing. A 260 HP passenger car engine, that uses the block of a 400 HP racing engine, has been detuned.

Torque is directly related to Amperage. Percentage loss of Amperage = percentage loss of torque. Running a 906 oz 6.1A motor at only 3.5A (About 43 % reduction) "Detunes" it down to about 520 oz of torque.

CR.

[Matt McColley]

so running that motor with a 3.5 amp cap will increase 34% over my 387 oz. N23s

and will run at ~81% of the recommended 640 oz.

(as opposed to ~60%)

Hmmmmmmmmmmm!

a third more torque....

I'll have to ask Jon if he will swap out one of my 387 oz. motors.

could be promising.....

would running the 6.1 amp motor try to draw more current than the G540s limit and damage the driver?

if not damage the driver, would it interupt the operation, or just run slower?

[Crevice Reamer]

so running that motor with a 3.5 amp cap will increase 34% over my 387 oz. N23s

and will run at ~81% of the recommended 640 oz.

(as opposed to ~60%)

Hmmmmmmmmmmm!

a third more torque....

I'll have to ask Jon if he will swap out one of my 387 oz. motors.

could be promising.....

would running the 6.1 amp motor try to draw more current than the G540s limit and damage the driver?

if not damage the driver, would it interupt the operation, or just run slower?

THAT'S not the promising part. That motor needs 7 Volts less than the 387. It will run quite fast on 50V. By trading just a LITTLE of that speed for torque--Changing pulley ratio to 1.2 to 1--You can HAVE your 640 oz torque and speed it too!

CR.

[skullworks]

Did you REMOVE the table and saddle to clean under them? If not, then there is still plenty of red gunk underneath that will interfere with your way lube.

CR.

When I pulled my saddle off to move the mill, there was nothing but a light layer of dry rust - no red goop.

Also one of the long dovetail ways on the table had about 15% non cleanup on the machined way.

Some steel wool & scotch brite will fix the rust issue, and the ways will do just fine as is. I know I bought a Seig X3 from Grizzley, not a Mori Seiki.

[Crevice Reamer]

You were lucky! Mine was just DROWNED in the stuff. Even UNDER the column.

CR.

[cadmonkey]

Matt - Definitely investigate increasing the pulley size, I know my setup is over geared thus limiting my Z rapids, but not overly detrimental to performance. By increasing your gear ratio you will see the rewards of torque and still be able to utilize the G540. When enough people look at it you definitely end up with a lot of little bits that when you compile them often come up with a workable (or at least plausible) solution. It might take some experimenting to find the 'perfect' ratio that yields a balance of torque and speed. I went for realtively high torque (something like 1560 in/oz) with no regard for speed and still yielded respectable Z rapids (40ipm), only difference is balls screw v ACME (I haven't been taking notes so if you've changed no offense intended).

I don't know the specs on the G540 but as it is 4 miniature versions of the G203V platform, I doubt Mariss did much different in its safe guards - just like the 203V uses current limiting resistors, if the G540 doesn't have current limiting resistors then they are built in and the current is limited so you won't pull more than 3.5A (the max IIRC) which probably wouldn't damage too many motors which might get connected to it. But keep in mind you will probably pull the max at a higher proportion than the typical motor it is designed to utilize, so be vigilant in cooling the drive unit, follow Gecko's directions to the letter.

To quote Hannibal from the A-Team (insert stogie here) "I love it when a plan comes together..."

Greg

[Matt McColley]

KL34H295-43-8A
the spec. sheet says this motor is 960 oz-in, while the tabulated listing calls out 906 oz-in?

I wonder which is correct?

If I switch over to this motor, will my 48 vdc 7.3 amp regulated p/s still cut the mustard?

That motor needs 7 Volts less than the 387

I just printed out the spec. sheets for both motors and I'm not following where you got that????