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WANTED Timing pulley design software.

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billCCED

billCCED

Mechanical
Aug 8, 2003
4
Can anyone here provide me with a link as to where I can get software for designing Timing Pulley's?
I would like to input: pitch, angle of tooth, depth of cut, and number of teeth. All of these parameters are available from catalogs.
And get out: blank OD, Depth of cut? Width of cutting tool, and any other paremeters necessary to allow me to make my own.
I am assuming single point cutting, with a flycutter. And using a rotary table and mill.

And of course, I would like it to be freeware, or shareware.
Preferably free standing, rather than part of ACad etc.
Thank you,
billCCED
 
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Bill,
I sent you a spreadsheet some while ago that does exactly what you are asking for.
Won't this work for you?
If not why, ?? it works for many others.
 
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Are you talking about a Gates
style heavy duty belt which can
either be hobbed or shaped?
 
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STEVEENG, I HAD A COMPUTER CRASH, AND LOST IT, BUT I ALSO HAD NO PROGRAM THAT WOULD OPEN IT. WOULD YOU RESEND IT TO WANLIKER@AOL.COM, THANK YOU. I WILL TRY TO FIND SOMETHING TO OPEN IT WITH. ANY SUGGESTIONS ON THAT?
BILLCCED

DIAMONDJIM, THIS IS FOR THE REGULAR TIMING BELTS SUCH AS THE XL BELTS, WHERE THE RIBS GO PERPENDICULAR TO THE LENGTH OF THE BELT. LOOKS LIKE A CATERPILLAR TREAD.

BILLCCED
 
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Sorry Bill,
Not got it on this computer any more.
I'll have to have a look on some backkup CD's
It was an Excel spreadsheet and if you looked on the web there are many links to a free viewer.

John S.
 
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You can treat the belt section as
a hob or rack cutter and approximate
the shape. Just remember that the
pitch line is outside of the gear
blank. I have a hob lsp program
that hobs teeth by inserting the
hob profile and progresses and rotates
much like a rack or hob operates
to form the profile. You then have to
array the profiles per the number
of teeth on the sprocket or pinion.

 
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Diamondjim, Using the hob/rack method of machining. Is about the same as some of the procedures I have located in hobby machinist magazines.

What I am looking for is a program, that I can input Pitch, Angle of tooth, OD of the blank, and tooth depth, all available from stock catalogs.
OD could be computed.

What I want back from the program is the width of the tip of the cutter, and the depth of total cut for the tooth.
I have a large group, on Yahoo, dedicated to making/modifying equipment for CNC in a non commercial, home shop, environment.
I would like to come up with a program/info on how they can make there own pulleys for modifying machines to CNC.

What is the name of the program that you have? Comercial, Freeware or Shareware?

Thanks,
billCCED
 
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I have only seen shaper and rack
type cutters from the belt manufacturers
as guides. You basically have a circular
pitch type arrangement and it would seem
that it would not be that hard for you
to use a spread sheet to work out the
reverse geometry of forming the belt
parameters around a circle based on the
number of teeth in your sprocket.
The hob program that I was speaking of is
free and I would be glad to e-mail it to
you. You could redefine the hob cross section
and rename this section hob.dwg in acad and
it will show you the basic format for the
sprocket.

(defun c:HOB ()
(command "SNAP" "OFF")
(setq cpg (list 0 0))
(setq ntg (getreal "\nEnter number of teeth on gear: "))
(setq ngh 18)
(setq odg (+ 2 ngh))
(setq pdg (getreal "\nEnter generating pitch dia of gear: "))
(setq dpg 1.000)

(setq xi (/ (* -0.25 pi pdg) ntg))
(setq mx (/ pi ngh 2))
(setq sph (list (* -48.0 mx) (* 0.5 pdg)))
(setq rot (/ -180.0 (* ntg ngh)))
(setq cnt -51)
(setq pt1 (list (* -2.2 odg) (* -1.85 odg)))
(setq pt2 (list (* 2.2 odg) (* 1.85 odg)))

(command "OSNAP" "OFF")
(command "SNAP" "OFF")
(command "zoom" "w" pt1 pt2)

(while (< cnt 51)
(progn
(command &quot;INSERT&quot; &quot;HOB&quot; sph 1 1 0 )
(command &quot;rotate&quot; &quot;W&quot; pt1 pt2 &quot;&quot; cpg rot)
(setq sph (list (+ (car sph) mx) (cadr sph)))
(setq cnt (+ cnt 1))
))
)
You do have to create hob profile with the
rack pitch line and tooth centerline at 0,0
and reverse the addendum and dedendum
like a rack cutter would require. Make a block
of this drawing and call it hob. The hob lisp
program assumes no backlash in the system.
I assume you know how to use lisp programs.
The program assumes the addendum of the cutter
is down. Have fun.
 
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Duh!!! what did you say? I know absolutely knothing at all about programming, thus the original request for a program.
billCCED
 
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Please contact York Industries for timing pulley software.
pbyers@york-ind.com
 
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