Spindle Idea

[SPEEDRE]

I was thinking maybe to mill off much rear portion and drilling or cutting slots in the rest of the cstg to lighten it up while keeping the bearing supported. I think by doing all that it could become a bolt on accessory.

[SPEEDRE]

Here's an idea I've been working on for some time now. It is based on an alum. thin wall tube held together by four 1/4-20 threaded rods grooved to fit up in a 2x2x1 bliock at each end carrying the bearings. One end has the collet and the other a sheave. I also think it could be water cooled by adding some fittings and silicone gasketing, or just filled with oil. Any comments or ideas to improve it?

[MikeAber]

Originally Posted by SPEEDRE Here's an idea I've been working on for some time now. It is based on an alum. thin wall tube held together by four 1/4-20 threaded rods grooved to fit up in a 2x2x1 bliock at each end carrying the bearings. One end has the collet and the other a sheave. I also think it could be water cooled by adding some fittings and silicone gasketing, or just filled with oil. Any comments or ideas to improve it?

Hi SPEEDRE,

I couldn''t open your Autocad file till I converted it. I will attach it here for others to see.

What is the target rpm range for your spindle?

What style and size of collet?

I have never seen a design like this. I am no expert but I believe thin wall would not be rigid enough and the ends would be free to twist due to torque from the milling cutter.

Mike

[MikeAber]

Hi everyone,

I am working on a mini-mill R8 spindle idea. I really like R8 tooling as I have a lot of it.

I wonder how much interest there is in a series of upgrades to the mini-mill spindle.This concept has been around in many other threads and many have pushed the limits allready.

Bearings, what is installed and what is available. What is the cost for speed? Is 15,000 rpm possible with a wet bearing system?
What about the gear drive system? are metal gears available, do they work better? Can the gears be reconfigured for a higher range of speeds?
Housings for attachment to a gantry style mill or vertical bench mill.
Can we install a larger and/or faster motor?
Using a DC motor around 1-2 horsepower and a motor controller to provide variable speeds with Spindle and Speed control in Mach2/3.

This will not be a spend as much money as you can approach.

I want to keep the Do It Yourself concept, and a team effort.

All of the projects based upon the R8 Mini-Mill housing ($99.95) or Mini-Mill Spindle ($49.95).

I anticipate this as a long term series of projects.

Or should there be a new thread or forum for the Mini-Mill spindle project?

Has all of this allready ben done?

What do you think!

MikeAber

[MikeAber]

Originally Posted by SPEEDRE I was thinking maybe to mill off much rear portion and drilling or cutting slots in the rest of the cstg to lighten it up while keeping the bearing supported. I think by doing all that it could become a bolt on accessory.

I am all for the bolt on accessory part.

I disassembled my housing over the weekend and did a bunch of research on bearings and read a lot of threads trying to find out what has been done in the past.

Mike

[PEU]

I do want to ellaborate on my drawings, but dont want to hijaak this thread

Pablo

[ViperTX]

Yeah, we need some pics. JRogue designed and build his own spindle.....perhaps he will chime in with his thread....I'd go searching for it...but I'm feeling a bit lazy.

[JRoque]

Here's the thread: http://www.cnczone.com/forums/showthread.php?t=7004. There's some really good info there contributed by many.

JR

[MikeAber]

Originally Posted by peu I do want to ellaborate on my drawings, but dont want to hijaak this thread Pablo

Pablo,

Please tell us about your spindle idea and elaborate about your drawings!

Mike

[MikeAber]

Originally Posted by JRoque Here's the thread: http://<b>http://www.cnczone.com/for...php?t=7004</b>. There's some really good info there contributed by many. JR

I highly recommend anyone interested in Spindle Ideas also subscribe to and read this thread! JRoge's spindle project is an excellent example of what can be done from the grass roots level up. Great work JR! I look forward to more of your great Ideas and future projects.

MikeAber

[SPEEDRE]

Some notes on my spindle concept. It could be mounted to the z carriage at both the top and bottom bearing blocks hopefully countering any torque twists. Target rpm range for my applications. I'd be cutting alum. 6061 t no thicker than .250 and HPDE or PTEG plastics at max .125, about 10k I think will be fast enough. I am hoping to use a small motor and keep it as quiet as possible.

[MikeAber]

Hi Speedre,

I think your concept is doable for the uses you describe. I am not sure you gain anything by using thin wall tubing. It seems to me that making two bearing blocks and designing a method to attach the thin wall tubing would be more difficult than making the spindle housing from a solid piece of material.
Any ideas on tool size and attachment method?

10,000 rpm should be easy for bearings 25mm and smaller depending on type and preload.

The bearings you list in your drawing are 8,000 rpm bearings these are the same size with a 15,000 rpm limit.

52mm is larger than 2", you may want to revise the bearing size or the the bearing housing size.


VXB Ball Bearings > Angular Contact Ball Bearings > 2 Ball Bearing 7205B 25x52x15 Chrome Steel - Spindle - Single Row Angular Contact
2 Ball Bearing 7205B 25x52x15 Chrome Steel - Spindle - Single Row Angular Contact


Quantity in Basket: none
Code: Kit1088
Price:$24.95

Shipping Weight: 0.75 pounds

Static Load (LBF): 1957.5
Dynamic Load (LBF): 3150
Limiting Speed (RPM): 15000
Closures: OPEN
Cage/Retainer: NYLON
Lubricant: OIL
Balls/Rollers: CHROME STEEL
Bearing Material: CHROME STEEL
Width (mm): 15
Outer Diameter (mm): 52
inner Diameter (mm): 25




Mike