PREBALANCED HOLDERS?

[jay]

We have a new First machine with a 10,000 rpm; this machine would be used mostly for machining aluminium.

What are the advantages for me to use prebalanced holders?

Does it really worth it?

 

--

JAI PERSAUD

[gary dunn]

probably none, balanced is good for 40K and up spindles. (my opinion)

[TheePres]

My previous employer purchased a 10k spindle machine, and bearings were overheating. Well after several service calls, their design engineer supplied us with balanced holders, to prove that cause of overheating was due to our cheap holders.

[GREG]

Most holders we buy are balanced to 10,000rpm as standard.

[gcode]

I think Command (who make very good tool holders)

recommends balanced holders over 8K RPM's.

 

At a previous job I did a lot of work with 1/16 and smaller carbide endmills and circiut board drills on a 10K Haas. I noticed a difference in both tool life (substantial) and surface finish (sometimes) when using balanced holders

 

[ 04-17-2002, 11:50 PM: Message edited by: gcode ]

[Guest CNC Apps Guy 1]

Above 10k is when you should start thinking about balanced/balanceable holders. Above 12k it's MANDATORY IMNSHO at 20k you're crazy if you don't, above 25, it's suicidal and I would not even step foot in your shop it's so dangerous.

 

Go Shrink fit! No moving parts to worry about, they come pre balanced and are more affordable than say a Tecnara Holder (which BTW makes VERY fine holders). Shrinmk fit gives better concentricity, tighter hold, all around it's a better system.

 

JM2C

[Greg Williams]

Hi,

 

I believe that all toolholders that spin at more than 6000 RPM should be balanced, My tests show that there are benefits in toollife and surface finish with Balanced holders. I am not a fan of shinkfits as they have a short life, after the cutter has been changed a number of times they start running out. We use BIG collet chucks 2um runout and balanced to 30K. We work with very small cutters 0006" so runout and balancing are the biggest issues for us.

[mold100]

Hi everyone,heres my opinion if it counts for anything.We use all parlec holders for high rpm spindle applications we use thier hydraulic chucks balanced to 30,000,our machine only go 20,000.If i use a so called balanced end mill holder(with a set screw) above 8 to 11 grand they hum pretty loud,meaning i,ve got vibration.The holders are parlec and supposed to be balanced to 15,000,but no solid holderwith a set screw in one side can truly be balanced,I use the Hydraulics whenever possible but with a 40 taper tool length is an issue.

[mold100]

[ 04-18-2002, 08:46 AM: Message edited by: mold100 ]

[jay]

Hi guys thanks for the input.

We deided to go with the regular Lyndex holders.

[ERIC14779]

talk to the ballancer guys about what is the force if a toolholder is .5 grams out of ballance and running at say 6000 RPM then at 10,000 RPM

 

you will be suprised at the amount of force that is produced that would be hammering on your spindle bearings.

 

ask also what ballance level your machine manufacturer has the spindle balanced to that would be interesting as the whole system from the spindle on down to the cutting tool is only as balanced as the most unbalanced part.

 

[ 04-20-2002, 01:28 PM: Message edited by: ERIC14779 ]