Any Mathmatitions On Line (lathe change wheels)

Gallery, Projects and General > How do I??

<< < (4/7) > >>

lordedmond:
John

There is a easy / expensive option fit a stepper motor to your dividing head get a division master or similar then you can divide any division or any degree you like

Stuart

fcheslop:
For odd number of teeth Iv used band saw blade round a ply former. Not very elegant but works for my simple needs
cheers

philf:
John,

Is your dividing head the BS0 type with a 40:1 worm and wheel?

If you have a division plate with 29 and 33 holes you could use compound indexing.

You need an extra detent plunger to engage with the 33 hole hole circle. (I made mine with a piece of stiffish spring steel and rivetted a pin in the end. The division plate is not bolted - it is free to rotate and the extra detent (in the back of the plate) stops it rotating.

To get 63 divisions you index 4 turns and 19 holes on the 29 hole circle and then 14 holes on the 33 hole circle by moving the plate. This doesn't give an exact division - the maximum error is 0.027 degrees.

The downside is that the chances of getting something wrong are high unless you're very, very careful.

A better solution would be for me to drill you 63 holes in a plate on my CNC mill. If you want one tell me what OD and ID. It would have to be in 3mm MS because, other than 16mm boiler plate, that's all I have. 63 holes would be very tight on a BS0 plate so the holes would have to be a bit smaller - meaning a smaller pin.

Cheers.

Phil.

lordedmond:
Phil

Could not John use his DRO on his mill to do a PDC with 63 holes or any factor of the same say 21

Stuart

philf:

--- Quote from: Stuart on August 31, 2015, 07:28:50 AM ---Phil

Could not John use his DRO on his mill to do a PDC with 63 holes or any factor of the same say 21

Stuart

--- End quote ---

Stuart,

I could easily generate a table of coordinates for John to do that - I'd just need to know the pcd of the holes. (It would be easier for me than making a plate. :thumbup:)

Edit - See Below

Cheers.

Phil.

Coordinates for holes on 100mm pitch circle with the plate centre at 0,0

   X     Y
1   0.000   50.000
2   4.978   49.752
3   9.907   49.009
4   14.738   47.779
5   19.422   46.074
6   23.913   43.911
7   28.166   41.312
8   32.139   38.302
9   35.793   34.912
10   39.092   31.174
11   42.001   27.127
12   44.494   22.811
13   46.544   18.267
14   48.131   13.542
15   49.240   8.682
16   49.860   3.737
17   49.984   -1.247
18   49.612   -6.217
19   48.746   -11.126
20   47.396   -15.924
21   45.575   -20.564
22   43.301   -25.000
23   40.597   -29.187
24   37.489   -33.084
25   34.009   -36.653
26   30.190   -39.857
27   26.072   -42.665
28   21.694   -45.048
29   17.101   -46.985
30   12.338   -48.454
31   7.452   -49.442
32   2.492   -49.938
33   -2.492   -49.938
34   -7.452   -49.442
35   -12.338   -48.454
36   -17.101   -46.985
37   -21.694   -45.048
38   -26.072   -42.665
39   -30.190   -39.857
40   -34.009   -36.653
41   -37.489   -33.084
42   -40.597   -29.187
43   -43.301   -25.000
44   -45.575   -20.564
45   -47.396   -15.924
46   -48.746   -11.126
47   -49.612   -6.217
48   -49.984   -1.247
49   -49.860   3.737
50   -49.240   8.682
51   -48.131   13.542
52   -46.544   18.267
53   -44.494   22.811
54   -42.001   27.127
55   -39.092   31.174
56   -35.793   34.912
57   -32.139   38.302
58   -28.166   41.312
59   -23.913   43.911
60   -19.422   46.074
61   -14.738   47.779
62   -9.907   49.009
63   -4.978   49.752

Navigation

 Message Index

Go to full version