Is this a typical ballscrew machining end?

[newpatch]

Hi All,

I'm in the process of designing my cnc machine. It's been very difficult locating a ballscrew drawing to use in my CAD software, but I found this one:



Is this what a ballscrew looks like after maching the ends? This one is an RM2005.

It's hard to see but the right side is a 15mm diameter and 12mm long. The left side starts with a 12mm, then steps up to 15mm for the nut, then stays at 15mm for the bearing. According to the spec's it's made for a 15mm bearing, BK15 & BF15. I originally thought the ballscrew was for a 20mm bearing so I drew the bearings in my design, but after seeing this I guess they take a 15mm bearing.

Can someone help me to verify this?

Also, I plan to use a G540 with Nema23 motors. I think they have 1/4" shafts. How or what type of coupler do I use to connect a 12mm shaft to 1/4" motor shaft?


newpatch

[SheerAutomation]

We are too designing our own CNC Machine. We are also looking at using a ballscrew type design like you have above. There are many different configurations you can get. Take a look at Misumi as they you can get the ends configured how you would like. It looks like the 20mm portion of the shaft would be used for the nut that moves your axis. The 12mm on the right side is used for the bearing supports on the end of the shaft. The 15mm on the right is for the Fixed bearing block and the 12mm on the right would be to couple your ball screw to the motor shaft. Misumi has many configurable options for zero backlash shaft couplers. I didn't take a look to see, but I'm sure you can get a 12mm to 1/2" shaft coupler.

Hope this helps.

[crane550]

Many places allow you to specify the machine work when you order. If your wanting to keep costs down you might consider looking into "miss-my-car" on eBay. The prices are pretty good and they will do the machine work for you. The ballscrews will not be top of the line THK's, but will certainly be a good notch or two better then ACME Rod.

[louieatienza]

Hi All,

I'm in the process of designing my cnc machine. It's been very difficult locating a ballscrew drawing to use in my CAD software, but I found this one:



Is this what a ballscrew looks like after maching the ends? This one is an RM2005.

It's hard to see but the right side is a 15mm diameter and 12mm long. The left side starts with a 12mm, then steps up to 15mm for the nut, then stays at 15mm for the bearing. According to the spec's it's made for a 15mm bearing, BK15 & BF15. I originally thought the ballscrew was for a 20mm bearing so I drew the bearings in my design, but after seeing this I guess they take a 15mm bearing.

Can someone help me to verify this?

Also, I plan to use a G540 with Nema23 motors. I think they have 1/4" shafts. How or what type of coupler do I use to connect a 12mm shaft to 1/4" motor shaft?


newpatch

I believe that looks right for a 20mm screw, but the best way to verify is to check the dimensions against the fixed and free end bearing bloxcks you will be using.

BTW, you may want a different diameter for the drive journal, depending on the type and availability of the coupler or pulleys you'll be using...

[newpatch]

"BTW, you may want a different diameter for the drive journal, depending on the type and availability of the coupler or pulleys you'll be using... "

Yeah, that's why I wanted to know what everyone else was doing...When time comes I'm hoping they can mahine it to fit my motors....

newpatch