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Technical Information - Burnishing

Standard Internal Diameter Burnishing Tools

Note : In these series Burnishing Length can be increased by means of special adaptors. Tool Holder other than mentioned is optional.

Stock Allowance Chart for Burnishing

Diameter	Stock Allowance
5 - 12 mm	0.01 - 0.02 mm
13 - 25 mm	0.013 - 0.020 mm
26 - 50 mm	0.013 - 0.025 mm
50 and above	0.018 - 0.035 mm

Speed & Feed Chart for Burnishing

Tool Dia(mm)	Speed(RPM)	Tool Feed Rate(mm/rev)
5 - 10	1020 - 4300	0.25 - 0.50
10 - 15	610 - 3100	0.45 - 0.90
15 - 20	500 - 1800	0.75 - 0.90
20 - 25	380 - 1500	0.8 - 1.4
25 - 30	300 - 1000	1.2 - 1.7
30 - 35	275 - 900	1.6 - 2.0
35 - 40	235 - 825	1.9 - 2.4
40 - 45	215 - 700	2.1 - 2.6
45 - 50	190 - 610	2.8 - 3.2
50 - 55	170 - 540	3.4 - 3.9
55 - 60	160 - 510	3.8 - 4.2
60 - 65	150 - 460	4.2 - 4.5
65 - 70	140 - 435	2.2 - 2.4
70 - 75	125 - 400	2.5 - 2.6
75 - 90	110 - 380	2.5 - 2.3
90 - 100	95 - 325	3.2 - 3.9
100 - 115	85 - 285	3.9 - 4.6
115 - 130	75 - 225	4.5 - 5.2
130 - 140 & above	70 - 210	5.8 - 5.9

The above given speed and feed are guidelines. However, exact parameters should be achieved with trials

Trouble Shooting in Burnishing

Problem	Cause	Remedy
Burnishing finish not achieved	Wrong tool setting	Correct the tool setting as explained
Burnished bore having taper and ovality	Pre-burnishing condition not maintained	Check pre-burnishied part for taper and ovality and correct pre-burnishing operation such as drilling, reaming, boring to desired tolerances
Excessive heat produced during burnishing	Inadequate flow of coolant	Use continous flow of proper coolants
Poor life of rollers	Inadequate flow of coolant Improper speed and feed selection Incorrect burnishing allowance	Use continous flow of proper coolants Select proper speed and feed as per chart Check pre-burnishing dimension and correct pre-burnishing operation to obtain desired dimension
Poor Surface finish after some usage to tool	Uncleaned tool Wear out rollers	Clean the burnishing tool properly after use and oil before storage Replace wornout rollers
Breakage of cage and guide rollers	Incorrect burnishing allowance Excess load	Check and correct burnishing allowance Set the tool as per the guide

Note: The cleaning and lubricating of burnishing tool before and after every use provides a continous trouble free service

Surface Finish for Various Operations

Operation	Burnishing	Honing	Ground	Reaming	Bore	Turning
Surface Finish (RA)	0.05 - 0.2	0.1 - 0.2	0.2 - 0.4	0.4 - 0.8	0.8 - 1.2	1.5 - 2.00
Diameter Change (mm)	0.025	0.063	0.063	0.25	0.5	0.95

Surface Finish Chart

Ra	R max	Rz	N	Triangle Mark
0.0013a	0.05s	0.05z
0.025a	- .01s	0.1z	N1
0.05a	0.2s	0.2z	N2
0.10a	0.4s	0.4z	N3
0.20a	0.8s	0.8z	N4
0.40a	1.6s	1.6z	N5
0.80a	3.2s	3.2z	N6
1.6a	6.3s	6.3z	N7
3.2a	12.5s	12.5z	N8
6.3a	25.0s	25.0z	N9
12.5a	50.0s	50.0z	N10
25.0a	100.0s	100.0z	N11	-
50.0a	200.0s	200.0z	N12
100.0a	400.0s	400.0z

Note: Rt = Ra x 4