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Q: What are the advantages of the ER type toolholding systems?
A: Major Benefits
ER Collet Concentricity - per DIN 6499
|
Q: What ER collet sizes are available?
A: See table below
ER Collet Model |
Dia. mm |
Length mm |
Gripping Range |
Number of Collets |
Spindle Adaptors |
Applications |
|
Mm |
Inch |
||||||
ER8 |
8.5 |
13.5 |
0.5-5 |
1/64-3/16 |
9 |
MT#, R8 Spindles, other industrial standards and customized flange mounts |
Milling, Drilling, Turning, Grinding, Engraving, Marking |
ER9 |
9 |
14.5 |
0.5-5 |
1/64-3/16 |
9 |
||
ER11 |
11.5 |
18 |
0.5-7 |
1/64-9/32 |
13 |
||
ER16 |
17 |
27.5 |
0.5-10 |
1/64-3/8 |
10 |
||
ER20 |
21 |
31.5 |
1-13 |
3/64-33/64 |
13 |
||
ER25 |
26 |
34 |
1-16 |
3/64-5/8 |
15 |
||
ER32 |
33 |
40 |
2-20 |
3/32-25/32 |
19 |
||
ER40 |
41 |
46 |
3-26 |
1/8-1 |
23 |
||
ER50 |
52 |
60 |
5-34 |
3/16-1-11/32 |
29 |
||
ER60 |
61 |
60 |
10-40 |
3/8- 1-9/16 |
30 |
||
ER90 |
91 |
89 |
20-60 |
25/32-2-1/8 |
40 |
Q: What Morse Taper chuck size will fit my machine?
A: The taper itself is roughly 5/8" per foot, but exact ratios and dimensions for the various sizes are given below.
Morse Taper |
Taper |
Gauge Line Diameter |
Minor Diameter |
Taper |
Angle |
0 |
19.212:1 |
0.3561" (9.045mm) |
0.252" |
2.00" |
1°29'27" |
1 |
20.047:1 |
0.4750" (12.065mm) |
0.369" |
2.126" |
1°25'43" |
2 |
20.020:1 |
0.700" (17.780mm) |
0.572" |
2.562" |
1°25'50" |
3 |
19.922:1 |
0.938" (23.825mm) |
0.778" |
3.188" |
1°26'16" |
4 |
19.254:1 |
1.231" (31.267mm) |
1.020" |
4.064" |
1°29'15" |
5 |
19.002:1 |
1.748" (44.399mm) |
1.475" |
5.188" |
1°20'26" |
6 |
19.180:1 |
2.494" (63.348mm) |
2.116" |
7.252" |
1°29'36" |
7 |
19.231:1 |
3.270" (83.058mm) |
2.750" |
10.00" |
1°29'25" |
Q: Apparantly the collets will not seat in the clamping nut?
A: This is actually a clever design feature of the ER tool holding system.
There is an eccentric retaining ring in the clamping nut. It serves to ensure that the collets are not getting stuck in the chuck taper when you release the clamping nut after use. The way to install the collets into the clamping nut is as follows:
1. Skew the collet a bit and twist it into the clamping nut
2. Install the clamping nut on the chuck body and tighten slightly
3. Insert the cutter or work piece to be held.
Reverse to release
Photo sequence: