Brierley ZB25 drill grinder - Cams

Just finished measuring the 2x cams that I have, the Standard RH 2 Flute cam (2) and the RH Step Drill Cam (6)

Measured on a rotary table with cam rotating Clockwise when viewed from above. '0' angle is at the index pin.
10 Degree increments, dropping to 5 degree at the critical transitions.

Pictures of setup, cams and graphs of the plotted data below.
Best Regards,
Howie.




Cam 6 Cam 2
Angle mm Angle mm
0 14.08 0 11.51
10 14.23 10 11.76
20 14.35 20 12.16
30 14.5 30 12.54
40 14.63 40 12.90
50 14.75 50 13.26
60 14.87 60 13.60
70 15.01 70 13.94
80 15.17 80 14.27
90 15.30 90 14.66
100 15.40 100 15.03
110 15.52 110 15.43
120 15.65 120 15.83
130 15.86 130 16.26
140 16.04 140 16.66
150 16.21 150 17.05
160 16.45 160 17.43
165 16.50 170 17.77
170 16.49 180 18.02
175 16.40 190 18.06
180 16.20 195 17.99
185 15.89 200 17.87
190 15.41 205 17.74
195 14.74 210 17.59
200 13.87 220 17.26
205 13.08 230 16.93
210 12.45 240 16.55
215 11.92 250 16.16
220 11.53 260 15.72
225 11.38 270 15.23
230 11.42 280 14.72
235 11.53 290 14.15
240 11.65 300 13.51
250 11.91 310 12.89
260 12.17 320 12.36
270 12.43 330 11.83
280 12.66 335 11.63
290 12.88 340 11.5
300 13.10 345 11.43
310 13.29 350 11.41
320 13.48 355 11.43
330 13.65 360 11.51
340 13.81
350 13.93

I would be interested in the same form of data for:-

Cam 4 Green, 180 degree (Only) point angel
Cam 6 Green, Pilot Drills of any angle

If someone can do the measuring and PM me, I can produce the fancy graphs to upload.
Although I'm looking for cams 4 & 6, any would be good just for completeness.
I can work with mm or inch
Thanks in advance
Howie.

You show data for a cam 6 then ask for data on a 6????

What size ball/tip did you use on your indicator?

I have a #2 cam RH
I also have a #8

Has there been multiple numbering methods used?

Sorry, it was late when posted.
You are correct I have the 6

It was the 4 I wanted , 180 Degree Point Angle.


If you would have a chance to measure the 8 that would be great.
This is the 4 Flute Tap & Core Drills.

I've just added a couple of sections from my manual, that shows the Cam names.

I don't know if it's intentional, but in both the LH & RH versions of the Special Point Plastic Cams, these seem to have duplicate numbers to the Pilot Drill Cams.

Regards,
Howie

Data from a Green #8 cam in inches

0 0.0000 index hole @ 6 o'clock
10 0.0071
20 0.0283
30 0.0527
40 0.0778
50 0.1028
60 0.1302
70 0.1558
80 0.1806
90 0.2015 index hole @ 9 o'clock
100 0.2108
110 0.2060
120 0.1833
130 0.1499
140 0.1014
150 0.0614
160 0.0294
170 0.0109
180 0.0064 index hole @ 12 o'clock
190 0.0149
200 0.0328
210 0.0530
220 0.0760
230 0.0986
240 0.1193
250 0.1418
260 0.1646
270 0.1844 index hole @ 3 o'clock
280 0.2000
290 0.2056
300 0.1938
310 0.1652
320 0.1197
330 0.0700
340 0.0334
350 0.0082
360 0.0002

Regarding my above post #5
The cam thickness at 0/360 deg is 0.450
All of the measurements of cam movement were only the changes from the original zero reference

Did you get more cam info?
I am busy buy a very old unit with 4 jaw chuck.
I got a pdf manual of ZB25/32, if that will help someone
Regards from South Africa

Thanks mjk for the data on Cam 8. It's been a while but I've put together the graph as a representation of what it looks like, plus a net sourced picture of a No. 8 cam. Obviously plotted showing heights in fractions of an Inch.

No. 8 Green (RH use) 4 Flute TAP and CORE DRILLS