39
RE-SHARPENING
A reamer is only sharpened on the bevel lead which performs the
cutting action. This operation must be done only by skilled operators
on appropriate machine tools.
When re-sharpening it is essential to maintain both the original relief
angle of 6°- 8° and the concentricity of the bevel lead.
* Feed Conversion Table
Reamer Diameter
Range (mm)
Feed (mm/rev)
Above
1.5
3
6
13
25
Up to
1.5
3
6
13
24
Light (L)
0.005 - 0.025
0.025 - 0.05
0.05 - 0.1
0.1 - 0.15
0.15 - 0.25
0.25 - 0.5
Medium (M)
0.012 - 0.05
0.05 - 0.1
0.1 - 0.15
0.15 - 0.25
0.25 - 0.5
0.5 - 1
Heavy (H)
0.025 - 0.075
0.075 - 0.15
0.15 - 0.25
0.25 - 0.38
0.38 - 0.76
0.76 - 1.27
Tolerances
Somta reamers are manufactured to produce holes to H7 tolerance.
The tolerance limits shown in the table beloware added to the nominal
reamer diameter.
eg. nominal diameter = 12mm
actual diameter = 12.008mm/12.015mm
Tolerance limits for reamers and hole sizes produced.
Reamer Diameter
Range (mm)
Cutting Diameter
Tolerance
Above
1
3
6
10
18
30
Up to
3
6
10
18
30
50
mm
+0.004 +0.008
+0.005 +0.010
+0.006 +0.012
+0.008 +0.015
+0.009 +0.017
+0.012 +0.021
mm
0 +0.010
0 +0.012
0 +0.015
0 +0.018
0 +0.021
0 +0.025
Hole Diameter
Tolerance H7
