Thank you for posting these reference materials! Would it be
agreeable to you if I included this on the LegacyCharts spreadsheet I
have been accumulating? It makes for a handy local reference all
things Legacy.
DanK
On Thursday, May 16, 2024 at 12:06:52 AM UTC-4 Curt George wrote:
Hello Again everyone!
I have posted these video's ,Mike posted some years back.
on his methods of indexing, These methods have always worked for
me in the past. and I hope some of you will learn and try his
methods as well.
https://www.youtube.com/watch?v=oHgzEKnON-o&t=17s
<https://www.youtube.com/watch?v=oHgzEKnON-o&t=17s> Crank handle
indexing.
https://www.youtube.com/watch?v=SjcFpO51upw&t=4s
<https://www.youtube.com/watch?v=SjcFpO51upw&t=4s> Carriage travel
indexing.
As well as some notes for Tim K. on crank handle indexing.
Crank Handle Indexing for the Rotary Table
Alternative Indexing Method for Legacy Ornamental Mills
------------------------------------------------------------------------
Mike Pung posted an idea of using the stock gears as a method of
indexing the rotary table instead of the stock handle. Using the a
drive shaft to control the rotary tables motion the following
indexes can be obtained with the stock gear set. I have come up
with what I believe to be a close to definitive answer on the
number of indexes available. They are as follows.
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36,
40, 48, 60, 64, 72, 80, 96, 120, 128, 144, 160, 192, and 240.
------------------------------------------------------------------------
The stock gear set will turn the spindle a specific number of
times per x-axis lead screw turn. For more information, see the
Crank Handle Indexing article.
<http://artscopes.com/legacyornamentalmill/tools/pungs_index_method/pungs_index_method.html>
Standard gear set - Leadscrew handle turns for one spindle
RevolutionGear No. of Cranks
A 8
B 12
C 16
D 18
E 20
F 24
G 30
The rotary table makes one revolution for every 8 cranks or 45º
increments per revolution. By multiplying the number of cranks
required to make one 1 spindle rotation by 8 you can calculate the
number of turns the x axis lead screw crank handle will need to
turn to move the rotary table one revolution. Each crank of the
lead screw handle can be used as an equal division.
Index Chart for Legacy's Standard Gear setGear No. of Cranks /
Divisions Degree Increments
A 64 5.625
B 96 3.75
C 128 2.812
D 144 2.5
E 160 2.25
F 192 1.875
G 240 1.5
These can be broken down by skipping crank revolutions. For
example, using the A gear and making a cut once every 4 cranks you
can index the rotary table every 16 locations. However as you can
see by this example, it would be much faster to index the table
using a different method. Using the numbers above, here are the
possible indexes available for each gear.
Rotary Table Indexes Standard Gear SetGear
Divisions
A
2 , 4 , 8 , 16 , 32 , 64
B
2 , 3 , 4 , 6 , 8 , 12 , 16 , 24 , 32 , 48 , 96
C
2 , 4 , 8 , 16 , 32 , 64 , 128
D
2 , 3 , 4 , 6 , 8 , 9 , 12 , 16 , 18 , 24 , 36 , 48 , 72 , 144
E
2 , 4 , 5 , 8 , 10 , 16 , 20 , 32 , 40 , 80 , 160
F
2 , 3 , 4 , 6 , 8 , 12 , 16 , 24 , 32 , 48 , 64 , 96 , 192
G
2 , 3 , 4 , 5 , 6 , 8 , 10 , 12 , 15 , 16 , 20 , 24 , 30 , 40 , 48
, 60 , 80 , 120 , 240
------------------------------------------------------------------------
Questions or comments or corrections, please feel free to contact
me - Tim
Updated: 6/27/2010
C.A.G.
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