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Why not use the RPM's you've got. If you want to go reasonably quick for a hobby machine pick something like 250Inches Per Minute and do the calc.

With a 5mm ball-screw, that works out to ~1270...

yep

I guess you are no longer interested?

Yep still have this. Would love to be rid of it. Have no way to test it. Also have some associated panasonic gear, Some sort of controller. I dont really know. But would certainly be willing to get...

.0000000000000000000000001lb.

Any load will deflect the beam, its just a matter of how much.

The other day I saw a post that had a good link to a dealer of machine levelling feet that were made of rubber or something similar and had a leveling screw/nut. I think it was here but maybe not,...

I have a large panasonic servo motor. Its admitedly very large for your application, 1000rpm max, 24n/m continuous torque. The shaft hollow is ~1.8".

I have no use for it and would be willing to...

This machine is just for the fun of building it. I dont really have a plan as to what to do with it when its built. Build another machine I guess, maybe a cnc lathe.

I've spent the last few days...

The bridge is split so that the spindle load is centered. Its alot harder to support the head as rigidly when its cantileavered out from its supports. The table is not as big as it could be made...

Its roughly 2Mx2.3Mx1.7M and about 5000lbs. It may need to go on a bit of a diet.

Figured it was about time to start a thread about the build I'm going to be starting soon. The model is getting into shape and alot of the motion hardware is already purchased. A set of 1.3M nr55 thk...

Yes. These machines exist and are available. A good way to deal with large but not deep work pieces. Such as full 4'x8' sheets.

But as it pertains to JGRO style/size machine. I dont believe the OP...

Install a flat steel plate below the bearings and put uhmw or teflon slides on the bottom of the table. Make it .0005" clearance or something like that. Now you've got some way to fight deflection.

The entire purpose of calling something big honking is to show the silliness of working on of the scale that someone is working on. Like having a jet powered lawn mower and a 1/10th acre yard. It's a...

Its not practical IMO.

Years of standard mills look like they do for a reason. Getting a gantry that tall stiff enough to machine to the kind of tolerances most machinists work to is going to be...

The type of steel you are using and its hardness has relatively little to do with how much deflection you will see over a span. The young's modulus (elastic bending) of all steels is within a fairly...

I'm no engineer. But my beam calculations for these rods with only the load of a light table on top to be atleast .004" or something like that in the middle. With cutting forces this would surely...

I recently unintentionally acquired a panasonic MFA250LE4NSE ac servo motor. The data plate says its 2.5kw, rated for 1000rpm. It has an encoder on it but I don't know anything about that.

Anyone...

Hmm, I have to admit I'm a bit confused by the most recent picture and explaination. So the slide towards the top of the picture is the Y (longest) axis on the lathe? If so why mount the rails to it...

So I'm building a cd/dvd storage unit, well really its a giant cd/dvd changer unit, relevant to this forum as its using step/direction/etc all borrowed from cnc goodies. The frame is 6'x6' and my...

After a bit more reading, I'd like to say i find it very interesting that both mach2 and tcnc use single point encoding. It seems like a system with a large count encoder >5000 or so could be used...

Although the frog does look interesting, it doesnt really let me do it myself. Also for this size of lathe it might not be able to drive a big enough stepper. Gear reducing the stepper kills the...

Ok, this is a little long winded, and I've also posted it over at practical machinists, but the inhabitents of this forum are alot closer to the kind of crazy I am. So lets see what you guys think.
...

small update, i have most of my parts in, missing some resistors and term strips, i built about half a board the other day and it seemed to go well.

I have to get my powersupply in order, and...

hopefully everyone has received their boards by now?

My digikey shipment should arrive shortly, need to start looking for a suitable programmer, suggestions?

here's a partial list.

LMD18245T-ND
PIC16F628-04/P-ND
277-1022-ND
495-1169-ND
P5196-ND
P5138-ND
495-1286-ND
1007PHCT-ND

Sending out remaining boards today, will go standard post as the rest of the boards did. They all arrived within 7 days of shipping, which i consider to be pretty good considering the cost difference...

Heres a pic, http://pad.phalnet.com/view.php?imgid=934

Ah, well then your boards are on the way. I guess it must be someone else that says they've paid that hasnt, or im hallucinating, or both. Either way you people know what the status of your wallet is...

Boards went out today, I apologize for the weeks delay. Boards went out to MO, CA, SASK, you who have paid know who you are. Those that havent submitted funds (vladdy I still dont see any payment in...