DXF files from scripts. Default oriantation is gear at 0/0 with a bottom land facing to the positive x-axis)-f T. Name of the DXF file to generate (without this option, a (tk) window is opend and the generated gear is displayed. Note that the gear is scaled to fit the viewport.) Argument types as used in abve options reference: N = positive integer.
Hobbyist: Ross Korsky(18 reviews)
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ATTENTION MAC USERS: If you experiance issues with the installer please e-mail me ([email protected]) and I will provide a workaround. Autodesk makes the installers and they are aware of the issued. That said, the Mac installer has been broken for quite some time and I have little confidance that it will be fixed any time soon!
Helical gears resemble spur gears with the teeth at an angle. They can be meshed in parallel or crossed orientations at 90 degrees or arbitrary angles and can be generated with as little as a single tooth forming a screw gear.
Gears may be specified in either the 'Normal' or the 'Radial' system or the fixed profile Sunderland standard, any of which can be generated as either Left or Right handed. Handedness in helical gears refers to the direction the teeth lean when the gear is placed flat on a table.
Using this add-in, proper Herringbone gears (such as the gears used for this add-in's thumbnail) can be created by using a Sunderland profile then mirroring the gear about one of its faces. In the case of Herringbone or other double-helix gears the handedness of the base gear is not as significant as it is for single helix gears - to effectively change the handedness of a Herringbone / double helix gear all you need to do is flip it over - whereas for a single helix gear it must be mirrored to change its handedness.
Finally, by setting a helix angle of 0 degrees, Spur gears can be created and defined in the metric system (as opposed to the sample Spur Gear script which defines gears in the American system) with this add-in.
Be sure to check out the Gear Down For What YouTube channel and on thingiverse - he is doing some amazing things with Helical Gears!
Read Help DocumentAbout This Version
Version 1.0.3, 11/5/20181.0.3 All tooth profiles are now created on their own sketches. This is a workaround for a fusion bug where sketch profiles are not always properly recognized when sketched off of z=0. 1.0.2 Fixing various bugs broken by, or exposed by, recent changes to Fusion. * Textboxes no longer appear to support list formatting - this was causing ERROR messages to be suppressed. * Expanding the Gear Parameters group was causing an infinite preview loop leading to very poor performance and likely causing crashes. ** Having the Gear Parameters expanded and having preview enabled still carries a performance penalty of causing the preview to be generated multiple times instead of just once. ** It can take a few clicks to get the Gear Parameters group to expand ** all-in-all Fusion does not yet support the concept of providing messaging to the user in a way which does not trigger the preview to be regenerated Other changes: * Number of teeth can now be set from a user parameter (gear is not updated if the parameter is changed after gear generation) * Increased the number of decimal places to nine for 'length per revolution' in Gear Parameters
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- Plastic
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Involute spline generator?
So, our Baja SAE team is running a spool that accepts polaris rear CV shafts. in the past we have just turned down a set of hubs that are already splined then pressed them into the spool housing and tigged them in. this year we are trying a new approach; machining a spool out of 4340 and then having the splines cut with an EDM. this allegedly will save us a lot of weight because the hubs are pretty heavy to start with and we have to leave a fair amount of material around the splines so they dont shatter after they are pressed into the spool.
all that being said, we are having trouble drawing the splines so we can give a .dxf to our EDM guy. we have all the dimensions as required by the machinist handbook for creating splines, but it does not translate to our solidworks knowledge. the only way we have figured to draw it in SW is to draw concentric circles for the minor and major diameter of the splines, do a circular pattern for each peak and valley, then connect them with an arc to create the curved face of each spline. the problem is that the dimensions in the machinist handbook dont give the radius of the spline face arc, so its a guessing game drawing it that way. also, we have not figured out any method of measuring said curvature.
soooo, the real question here is how do you create this drawing? what program would you use? is there a solidworks add in that we are not aware of? sorry if this is a really obvious answer to you guys but in the past we have just cut external splines using a TNG or SPG insert in a specially made cutter to get a 30* or 45* spline pitch which has been 'close enough', but because we are using the EDM method this year for internal splines we would like to actually cut the right profile.
your help is greatly appreciated! - Diamond
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Involute splines are an involute curve, the curve is a constantly changing radius.
Gearotic may be the best inexpensive way to generate that curve - Gearotic Motion - HuFlungDungDiamond
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I'm not 100% sure of this method but here it is: if you have software that will draw involute gears at any specified pressure angle, you might be able to modify the resulting geometry to suit.
The trick is to understand what the spline specification stands for: example a 1.375' OD, 21 tooth 16/32 DP 30° PA means that the spline has the height charactersistics of a 32 DP gear but the circular pitch characteristics of a 16 DP gear.
So the involute is not a different shape simply because the tooth height is truncated (but that is only a supposition on my part).
However, you need to know the pitch diameter of the spline, and this can be deduced from the spline OD and the addendum height of a 32 DP gear in this example. The addendum height is 1/DP or 1/32' in this example. So given a 1.375' spline OD, then the pitch diameter is 1.3125' (twice the addendum height was used across a diameter).
Going to your gear software, generate a 30° pressure angle gear with 21 teeth on a 1.3125' pitch diameter. I use OneCNC and it has this flexibility to draw any pressure angle on any pitch diameter (within reason, I guess).
Now sketch in the OD of the spline with a 1.375' diameter circle based on the gear center.
Sketch in another circle representing the root depth of the spline, it will be somewhat smaller than the addendum height because root clearance is usually given. That would be somewhat less than a 1.250' diameter circle.
Then trim one of the generated gear teeth to these two new circles and delete the remainder of the generated gear geometry. Copy and rotate 20 copies of the trimmed geometry to get the whole spline.
Then of course, you need to figure in some sort of 'fit tolerance' when profiling the geometry so the spline will actually fit a gauge. Probably that fit tolerance is greater than any slight errors of drawing the spline with this method. If I had an EDM, I'd have already tried it to tell you if it works or not - Stainless
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found this and it is for SW
Camnetics ::CamTrax64 Software - John StevensonStainless
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+1 for Gearotic.
You don't have to work anything out as most of the regular splines are in the library.
Top left is the library button and you then get a drop down.
Ignore the mating gear, it has to put one in and because the PA is 30 it looks a bit weird.
If you need to fine tune it you can do with the boxes at the top.
John S. - Plastic
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so i think what you are describing is what John S. said Gearotic does automatically. i tried making the spline in Gearotic, and it is indeed in the library of standard splines. however, when i try to save it as a dxf the program keeps crashing and or freezing up. do you have to buy the full version to save files? im hesitant to do that because we dont know if it will work and i dont know if we will be using it again or not. if anyone wants to take a crack at it to help out the Baja team, here is the info that i have.Originally Posted by HuFlungDungI'm not 100% sure of this method but here it is: if you have software that will draw involute gears at any specified pressure angle, you might be able to modify the resulting geometry to suit.
The trick is to understand what the spline specification stands for: example a 1.375' OD, 21 tooth 16/32 DP 30° PA means that the spline has the height charactersistics of a 32 DP gear but the circular pitch characteristics of a 16 DP gear.
So the involute is not a different shape simply because the tooth height is truncated (but that is only a supposition on my part).
However, you need to know the pitch diameter of the spline, and this can be deduced from the spline OD and the addendum height of a 32 DP gear in this example. The addendum height is 1/DP or 1/32' in this example. So given a 1.375' spline OD, then the pitch diameter is 1.3125' (twice the addendum height was used across a diameter).
Going to your gear software, generate a 30° pressure angle gear with 21 teeth on a 1.3125' pitch diameter. I use OneCNC and it has this flexibility to draw any pressure angle on any pitch diameter (within reason, I guess).
Now sketch in the OD of the spline with a 1.375' diameter circle based on the gear center.
Sketch in another circle representing the root depth of the spline, it will be somewhat smaller than the addendum height because root clearance is usually given. That would be somewhat less than a 1.250' diameter circle.
Then trim one of the generated gear teeth to these two new circles and delete the remainder of the generated gear geometry. Copy and rotate 20 copies of the trimmed geometry to get the whole spline.
Then of course, you need to figure in some sort of 'fit tolerance' when profiling the geometry so the spline will actually fit a gauge. Probably that fit tolerance is greater than any slight errors of drawing the spline with this method. If I had an EDM, I'd have already tried it to tell you if it works or not
No. of Teeth
20
Pitch
24/48
Pressure Angle (deg)
30
Base Diameter
0.7217'
Pitch Diameter
0.8333'
Major Diameter
0.921'
Form Diameter
0.879'
Minor Diameter
.792'/.797'
Circular Tooth Thickness
Max Actual
0.0680'
Min. Effective
0.0654'
thanks all,
metty - John StevensonStainless
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Gearotic needs to be registed to save etc.
Try this:-
http://www.stevenson-engineers.co.uk...spline_20T.dxf - Hot Rolled
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I believe MITcalc which an is Excel based engineering calculations software has a module to generate splines as a DXF file. I find the software useful for lots of mechanical engineering calculations
Shaped couplings of shafts with hubs - Aluminum
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I use Inventor Pro and if you are looking for a ANSI B92.1, 30deg, fillet root, side fit this should be it. I have a wire EDM and I have used it to cut splines from Inventor before with excellet results.
- Plastic
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Forgive me if I'm butting in where I don't belong, but maybe I can help...
I cut splines on the EDM 'a lot'.That's a flat root spline. Also, the 'space width' looks off (is .07816 ??). Again, I don't mean to butt in, and maybe I'm missing something.Originally Posted by Space WolfI use Inventor Pro and if you are looking for a ANSI B92.1, 30deg, fillet root, side fit this should be it. I have a wire EDM and I have used it to cut splines from Inventor before with excellet results.
If you like I can generate your spline for you. I would need to know what kind of fit you want (nominal / tight / big) and I'd run the space width accordingly. I would think that you'd want to start with something in between .0680 and .0654 ??
The 'circular tooth thickness' you specify should be noted as 'circular space width', when generating splines with CAD programs it does matter. But that's not a big deal, it looks pretty clear what you need. - Dan from OaklandTitanium
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If you don't want to hassle the EDM route-
Mark Williams Enterprises has a good selection of common automotive axle spline broaches and is quite reasonable broaching a few parts. Call them and ask what pilot diameter the parts need to have after you confirm if they have the broach you need. I think they charged me about $75 to broach several spools a few years ago. Unless your EDM guy is doing you a favor, I doubt you can wire these for that much.
Dan - Plastic
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Here's my go at it. Ya'all aint gonna get better than this...
Ran the major diameter towards the high to be sure to meet the form diameter requirement with a .014 fillet radius. Minor diameter nominal. CSW nominal @ .0667.
EDIT: I use Esprit with the gear module. - Aluminum
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I agree with PowerJunkie. His is better than mine.
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