Hi,
Thanks!
Are all these Dividing Heads a copy of the original Brown and Sharpe design?
I mean if I want to take mine apart and clean it, it will come apart like a B&S?
Disassenbly and Assembly of a Brown & Sharpe Dividing Head - YouTube
?? Why B&S if you do not HAVE B&S?
Far wiser to just download the
Ellis manuals, specs, and parts lists as they are a specific match.
Simple DH to keep in good repair, too.
As to a B&S connection? IRRC the plates and tables are similar. But that's true of MANY DH with the same worm ratios.
Example from my own plate-search cross-ref notes:
My Ellis dividing plates are 5" dia X .315 thick, 1 1/8" bore
3 mounting holes. I've misplaced the bolt-circle info. Perhaps someone else can post it.
Plate hole counts are as follows:
Standard Plates:
No. 1- 15, 16, 17, 18, 19, 20
No. 2- 21, 23, 27, 29, 31, 33
No. 3- 37, 39, 41, 43, 47, 49
Optional High Number Plates:
No. 4- 25, 61, 71, 83, 91, 93
No. 5- 51, 53, 63, 73, 81, 96
No. 6- 22, 57, 67, 77, 87, 97
No. 7- 28, 59, 69, 79, 89, 99
===============================
Shars plates:
A Plate:15,16,17,18,19,20 Same as Ellis #1
B Plate:21,23,27,29,31,33 Same as Ellis #2
C Plate:37,39,41,43,47,49 Same as Ellis #3
Believed to be available in both 150 mm (6" nominal) and 100 mm (4" nominal)
Bore diameter believed to be 21 mm / 7/8"(.826") on small ones
Bore diameter not known to me for larger ones
==================================
Set of three listed by a vendor based in India
A set of 3 pcs Dividing plates set for HV4 & HV6 Rotary Table.
Centre Hole of the plate is 21 mm (0.0826)
This set gives"
15,16,17,18,19,20
21,23,27,29,31,33
37,39,41,43,47,49
==================================
Vertex: Taiwan originally, mainland China now (maybe?):
For VERTEX DP-1 DIVIDING PLATE SET FOR 4 -6" ROTARY TABLES
A plate with 15, 16, 17, 18, 19, and 20;
B plate with 21, 23, 27, 29, 31 and 33; and the
C plate with 37, 39, 41, 43, 47, and 49 divisions.
==================================
Larger Imported plates listed on eBay for 6" , 8" 10" and 12"
horizontal, vertical and tilting rotary tables.
These have FOUR mounting holes
Package is just TWO dividing plates, A and B, plus a crank handle and sector set
Any number from 2-66 and 68-132 which is divisible by 2,3,and 5 can be divided evenly.
A. 34.37.38.39.41.43.44.50.52.56.61
B. 46.47.49.51.53.54.57.58.59.62.64
OD of plate : 5-1/8"
The diameter of the center hole in the handle: 0.472"
The diameter of the center hole on the dividing plate : 1.496"
The width of groove in the handle : 0.551"
The length of groove in the handle: 1.653"
===============================
Bridgeport plates:
5 1/2"dia, 7/32 thick, 1 1/8" bore, 1/8" holes
2 mounting holes not 3.
#1 - 9, 28, 34, 41, 47
#2 - 10, 29, 35, 43, 49
#3 - 21, 31, 37, 44, 53
#4 - 25, 32, 38, 46, 59
=================================
L&W Chuck Co:
For 6.5" swing
Plate 1 > 15, 16, 17, 18, 19, 20
Plate 2 > 21, 23, 27, 29, 31, 33
Plate 3 > 37, 39, 41, 43, 47, 49
* The plate thickness is just under .250
* .125 diam div holes
* 1.125 centering hole
* Bolt circle 1.750, 3 CS .27 holes
====================================
Refer to Ellis tables for use on 40:1 dividing head or rotab
A 90:1 ratio DH or ROTAB needs other tables, but they are around.
There are
at least two other ratios that have been used more than
just 'once in a great while' for DH and rotabs, but 40:1 and 90:1 are common.
NB: adapting other plates and sector arms to an Ellis needs 'mostly' a stub, stepped bushing to move the whole shebang outward so it clears, then an offset mount of some sort for the reference mechanism.
Any error will be divided by 40, so it is precision work, but only reasonably so, not insanely so.
Bill
