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@mactech54
I will use the spindle in my router so there will be almost no load.
Is the oil coolant just for cooling down the housing or does it flow right trough the bearings so cooling and lubrication is achieved together? Sorry I'm lost at that point.Quote:
Originally Posted by Mecanix
oh, and yes, I don't have a dynamic balancing equipment. I wanted to build one but I never get into it.
I'll be very honest with you, I have absolutely no idea. All I know is there are two tubes connecting to the main spindle assy; an intake at the front (circled in red) and outlet on the back.Quote:
Originally Posted by Azalin
My assumption would be housing cooling as I just can't figure out how the oil would be delivered to and from the bearing themselves.
Other pic is the oil chiller (white boxxy thing). Its big man... that 20k rpm spinner really gets hot passed 15k when machining with a 0.5kg BT30s holder/tool. More or less 20~30min in the operation and the chiller kicks in...
Not at the shop currently, best pics I could quickly find on hdd to illustrate.
Keep us updated, g'luck with the project
All the Chinese Spindles are using Grease on there high speed spindles, and they last quite wellQuote:
Originally Posted by Azalin
The oil is for the Bearings lube, and is normally in a mist with air, which helps to clear dust etc. from out the front through the labyrinth seal but high quality grease can be used at those speeds, oil lube you can run at higher RPM and if your air is dry, the Bearing can last longer
But without any balancing you won't be running at those speeds anyway 12,000 RPM will most likely where you will be at, any part that you machine that is concentric inside and out will be in balance any cutout screws nuts Etc. will throw it out of balance, so for a smooth running spindle balancing is a requirement, including tool holders, although ISO 20 tool holder can be machined machined as one piece, shrink fit to hold the cutter can eliminate any need for balancing of the tool holder
Those are the holders "type" I'm literally forced to use with for HSM with above 12k revs. Some ideas... in case you plan on making some for high speed rev...
Apart from the facemill (i.e. 3000RPM max), all the rest are dyn balanced. Notice the no hex-nuts and concentric assy (SK collets)
Any other types of holder and trust me it feels really weird around the machine at above +12k speed lol
Fast is good man, bloody terrifying (andhot), but good :D
An oil chiller is not an absolute requirement for high speed spindles. Fanuc RoboDrills come with 24k spindles (ceramic, gease packed bearings) that are air cooled.
those 24k fanuc spindles spindles also have low preload and a relatively short service life.
coolant around the spindle and bearings on a belt drive spindle is *mostly* about thermal stability. the fluid keeps the spindle within a few degrees, and you get more accurate parts. you also get less chance of the bearings binding up - which can happen if the nose gets very hot.
I would say for your first spindle, disregard any cooling
For the bearings, use grease. Oiler systems are out of the scope of what you need. These days the only machines using oil mists are large spindles running very fast (40krpm HSK50 for example). The bearings you buy will actually tell you what to use for a given preload and rpm. If you are using cheap bearings, none of this will even matter.
I was at CMTS today and saw a number of rather nice spindles.
you should look at:
Meyrat
NSK America
Jianken
Microlab
Andersen
HSD
Those guys all make small spindles, some with motors, some belt, some direct, ranging from hundreds to tens of thousands of dollars. Microlab basically makes exactly what you are trying to do, for about a grand. Study how they have laid them out, power, bearing size, rpm limits.
Hi,
I've been busy with other things but managed to make some small progress on the spindle too.
I'm still going with the belt drive design but thinking about the direct drive idea.
When I connect the spindle with a coupling to the motor on the top then how the air cylinder works? How to design it?
Direct drive cant use an air cylinder generally. not impossible, but its not space efficient.Quote:
Originally Posted by Azalin
Most will be hydraulic, some mechanical.
you put a cross pin through the side of the spindle to actuate the drawbar, and then press that with a hollow hydraulic cylinder in the housing, or a mechanical lever..
What are the dimensions (and angle) for the iso20 holder I'm also trying to make one.Quote:
Originally Posted by Azalin
look up shaublin iso 20Quote:
Originally Posted by vandalo05
they have a drawing that shows the tool holder and the taper (and their gripper).
You can buy iso20 er holders for $10. so, hard to justify making your own, unless you need something special
Angle is same in all iso type holders. I don't remember right now the exact value.Quote:
Originally Posted by vandalo05
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