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Your cart is empty. ER-20 SERIES 14Pcs Collet Set,Please Check Picture For Products Details:
T.I.R.(Total Indicator Reading): Maximum 8um(0.008mm)
Wide holding range:1mm(0.039")
Collet Diameter:21mm(.827'')
Collet Length:31.5mm(1.240'')
FEATURES:
1.Package include: 14 x ER20 8um Collets(1/2/3/4/5/6/7/8/9/10/11/12/13mm+1/8 clamping diameter)
2.Made of high grade spring steel.high precision
3.Used for boring, milling, drilling, tapping, grinding and engraving operation etc.
4.The correct methods of mounting the collet nut:
4.1. Put the chuck into the pressure cap, gently turn the clamp spring, when eccentric portion of the pressure cap recessed clamp spring groove. Along the arrow direction and use equal force to push clamp spring, can mount pressure cap.
4.2. Put the clamp spring and cap all together installed on the chuck body or spindle. Insert into the clamping hole after wipe the cylindrical shank, use a wrench to tighten the pressure cap, until clip firmly the tool before use. (Note : Avoid fastening pressure cap that not installed tool, to avoid damage the clamp spring)
4.3. Use a wrench to loosen the pressure cap and took out the chuck or tool, remove the tool. Along the direction of the arrow push out the clamp spring. Then according to need replace other clamp spring.
BF Hammer
Reviewed in the United States on November 10, 2024
I am a perfectionist and these are high end!Very please.Working great on my machine.Definitely purchase again.
JTH
Reviewed in the United States on April 5, 2019
ER20 14 pieces 1 to 13 mm set.Received this item nicely packaged. I immediately checked them in my mini mill. I used a 4.5mm and 8mm brand new, unused drill bit with the size stamping scraped flush. My setup indicated less than .0009"(24um) runnout. If I had lab grade equipment, I would have measured their stated 8um(0.0003")T.I.R. Trying to measure 3um accurately takes a lot of effort and time. In real world hobby use, 30um(.001") is good enough and at 50um(.002) you are greatly reducing tool life.You have to have an understanding of Runout and what it means. I would suggest looking up Spindle Runout at CNC Cookbook for a full understanding.Out of 5 sets of collets I recently purchased, these are the only ones I would use to cut hardened steel with a small diameter bit. For comparison to other collet sets I purchased, Runouts measured from greater than .001" to .002" with one ER32 set measuring .003" to .008". Collets with bad runout are suitable for work holding in a lathe if you understand the limitations but for spinning cutter bits in a mill, you want as close to zero TIR as you can get to prolong tool life. One more piece of info for comparison, my good quality keyless chuck measures .005 TIR but a dril bit is quite flexible compared to a hardened, rigid mill cutter and is a whole different beast.
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