I am currently learning about gears as i want to make one on my mill. This really helped understand the process better. I might 3D print one instead. Thanks
The pressure angle is the angle of the line that the point of contact follows through the mesh. 14.5º pressure angles were traditionally used because it allowed a greater variance in manufacturing tolerances. It is much easier to control tooth thickness and consequently backlash with a 14.5º pressure angle. 14.5º also do not create a lot of separating forces which was desirable with poor bearing technology. Surface contact is not a function of pressure angle it is a function of load. The surface contact is just along a different angle. 25º pressure angle gears do have a much stronger tooth but also have much greater separating forces. Gear noise and wear is largely down to gear quality. Modern technology makes 25º gears preferable in most cases.
Hey EJ I want to say Thank You for this clear and helpful video. From time to time I've had to struggle through the gear generating tools in Fusion and Inventor, and it's always quite difficult. As everyone knows, the Autodesk help is worthless. I'll be checking out all your videos!
I have made a few spur gears, a metal test one on mill, and one 3D ABS spur gear for my old South Bend 10K lathe. I spent quite a while looking at many TH-cam vids to figure out some of the various settings and wanted to just say YOUR VIDEO HERE is one of the very best and easiest to understand ones I have yet to run across!! Thanks and ou have another subscriber now.
I believe you meant to say that the pressure angle is the angle between the normal line of the pitch surface and the tangent line of the gear wheel, not the tangent line of the pitch, which would be 90 degrees offset from this.
Your definition is correct. I hope to explain this in as simple ans tripped down a way as possible. A book on gear design would explain it the way you are explaining it, but it would sound like a different language to someone not privy to machine design terminology.
i have a good question how do you slow down a motion link ? i want to inspect the gear in the motion but going way too fast and i can't find a solution on google
@@AvivMakesRobots i am too begineer to anwser that but i followed a youtuber making simple 2 gear with animation with a motion link between the 2 . after messing around with speed hack i see that its not interfering with each other :D if you want i can put a imgur screenshot do you want 1 ?
Great video! I have a quick question. I'm having a hard time with an appropriate gear backlash. The following 2 gears need to properly mesh: 2:1 Ratio Gear 1: Pressure Angle: 20 Module: 0.60 Number of Teeth: 10 Root Filled Radius: 0.20 mm Gear Thickness: 3 mm Pitch Diameter: 6 mm Backlash: 0 Gear 2: Pressure Angle: 20 Module: 0.60 Number of Teeth: 20 Root Filled Radius: 0.20 mm Gear Thickness: 3 mm Pitch Diameter: 12 mm Backlash?? Gear 2 will be injection molded from glass-filled nylon. Do you have a good recommendation of backlash for Gear 2? I was thinking of going with 0.15 mm. Thank you!
I would definitely consider 3d printing this first, possibly in SLA. The acceptable backlash is dependent on both the application and manufacturing tolerances.
Best way is by finding it on the manufacturer spec sheet. If you don't have this, you will need to measure at the point between where two gears mesh. Hope this makes sense. This will be difficult to measure with a caliper or measuring tape... I highly recommend getting this from the manufacturer.
Excellent presentation 👌! Can I use this fusion 360 script to make sprocket for tank tracks how can you calculate sprocket pitch using holes distance between tank tracks
Hello Glen, Yes! This is possible but may take some trial and error to get right. It is mostly a tool for creating meshing gears. I would see if there is a sprocket tool first. I really like this plug-in because it is simple to use and effective.
@@AvivMakesRobots likely there is a 'roller chain' generator, like in Inventor. You'd specify your own 'chain' (the tank tread) and your own sprockets, including any number of idler gears (all the in-between wheels on the ground inside a tank tread) All 3 wizards are a challenge to use (spur gears, belts/pulleys, roller chain/sprockets) but they do work, both Inventor and Fusion have this.
i do not understand where is this theoretical cangent point on radius on green line, becouse on radius it may be anywhere. whatewer its looks like this angle changes width of upper part of tooth
I understand your question about the green line: The green line is tangent to the inner circle of the gear. That is why the green line can't just... be anywhere along the radius. So first point for green line: tangent to inner circle second point for green line: perpendicular to top arc of tooth.
Very helpful video! How could one actually measure pressure angle on an existing item, like the spline of a differential axle? Naturally, it's much harder in the flesh with such a small pitch gear part.
The best way to do this is to first 3d scan it. If you can't 3d scan it, the second best thing to do is to lay it flat and scan it with a paper scanner, or to make an ink print. From there, it is a matter of using the right tools to get an estimate... remember, there are common pressure angles like 20 degrees and 14.5 degrees. It is probably one of these.
@@AvivMakesRobots Good advice, thanks mate. Yep used in this diff is either 30 or 45 degree. I've chosen 45 degree for the differential centre, however on the outer wheel hub there is a female splined driven gear (as the axle is floating, and goes inside this to turn the spindle / hub / wheel) that is kept captive inside the hub. Don't want to pull apart the whole hub to remove it so the ink print is a fantastic idea!!!
It would be immeasurably more helpful if the gear diagrams were drawn to scale of their respective pressure angles. Simply dimensioning the same gear differently makes this exceedingly difficult to follow.
I understand what you are saying. Since I did not, an easy way to visualize is to click between different pressure angles when in the gear generator tool and to look closely at the teeth changing. You will see the radius of the tooth changing to be either smaller or larger and it will be abundantly clear.
Yes, these are example graphics. Once the gear is generated at that pressure angle, it will be visible in both the preview and when meshed with a compatible gear.
The green line is not a tangent. There are no arcs in a spur gear profile. It is an involute curve. The pressure angle is not what you define. It is the angle between the line between the mating gears centers and a line tangent to the involute curve at the point of contact between each gear.
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I am currently learning about gears as i want to make one on my mill. This really helped understand the process better. I might 3D print one instead. Thanks
John,
I was pleased to hear you learned some things from this video! Thanks for your comment and I hope the gear comes out well.
The pressure angle is the angle of the line that the point of contact follows through the mesh. 14.5º pressure angles were traditionally used because it allowed a greater variance in manufacturing tolerances. It is much easier to control tooth thickness and consequently backlash with a 14.5º pressure angle. 14.5º also do not create a lot of separating forces which was desirable with poor bearing technology. Surface contact is not a function of pressure angle it is a function of load. The surface contact is just along a different angle. 25º pressure angle gears do have a much stronger tooth but also have much greater separating forces. Gear noise and wear is largely down to gear quality. Modern technology makes 25º gears preferable in most cases.
I see. Thank you for this analysis.
Wow, by watching your video, I feel more knowledgeable in this area. I work with them from time to time but I never understood it. Thank you for this
Thank you! Glad you enjoyed it and got some value out of it. You work on your bike gears, right?
@@AvivMakesRobots Yes I do =)
@@Thevoicebehindthehelmet Very cool! That was what I guessed.
Thanks for a very helpful review on gear design.
You got it!
Hey EJ I want to say Thank You for this clear and helpful video. From time to time I've had to struggle through the gear generating tools in Fusion and Inventor, and it's always quite difficult. As everyone knows, the Autodesk help is worthless. I'll be checking out all your videos!
Thank you so much! I'm in the comments if you ever have a question about anything.
I have made a few spur gears, a metal test one on mill, and one 3D ABS spur gear for my old South Bend 10K lathe. I spent quite a while looking at many TH-cam vids to figure out some of the various settings and wanted to just say YOUR VIDEO HERE is one of the very best and easiest to understand ones I have yet to run across!! Thanks and ou have another subscriber now.
Wow, thank you! There is a lot more great content to come, so welcome aboard!
Really helpful for a new F360 user thanks.
Thank you!
hi. I want to ask: i'm try to make arbor press, i will choice 14.5 degree (for ram and pinion - 3 modul). this is right choice or not. thnx
I believe you meant to say that the pressure angle is the angle between the normal line of the pitch surface and the tangent line of the gear wheel, not the tangent line of the pitch, which would be 90 degrees offset from this.
Your definition is correct. I hope to explain this in as simple ans tripped down a way as possible. A book on gear design would explain it the way you are explaining it, but it would sound like a different language to someone not privy to machine design terminology.
Thank you so much! 🙏
Sure thing!
i would like the video but its at a 420 but in my heart i loved it
Lol. You're doing the right thing!
helpfull..
Thanks!
Thank you!!
You got it!
i have a good question how do you slow down a motion link ? i want to inspect the gear in the motion but going way too fast
and i can't find a solution on google
You may want to just use your cursor to move the gears instead of with the motion animation. Then you can zoom in and look closely at the meshing.
Edit1: aslo by mouse it snap on the wrong place is there a way to make it not snap to each angle degree ?
Edit1: aslo by mouse it snap on the wrong place is there a way to make it not snap to each angle degree ?
@@buder5116 How is it constrained? The teeth should not be constrained.
@@AvivMakesRobots i am too begineer to anwser that but i followed a youtuber making simple 2 gear with animation with a motion link between the 2 .
after messing around with speed hack i see that its not interfering with each other :D
if you want i can put a imgur screenshot do you want 1 ?
Great explanation.thanks lot.
Glad you liked it!
Fine vedeo
Thank you!
Great video! I have a quick question. I'm having a hard time with an appropriate gear backlash. The following 2 gears need to properly mesh:
2:1 Ratio
Gear 1:
Pressure Angle: 20
Module: 0.60
Number of Teeth: 10
Root Filled Radius: 0.20 mm
Gear Thickness: 3 mm
Pitch Diameter: 6 mm
Backlash: 0
Gear 2:
Pressure Angle: 20
Module: 0.60
Number of Teeth: 20
Root Filled Radius: 0.20 mm
Gear Thickness: 3 mm
Pitch Diameter: 12 mm
Backlash??
Gear 2 will be injection molded from glass-filled nylon. Do you have a good recommendation of backlash for Gear 2? I was thinking of going with 0.15 mm. Thank you!
I would definitely consider 3d printing this first, possibly in SLA. The acceptable backlash is dependent on both the application and manufacturing tolerances.
How to measure pitch diameter in order to calculate the DP or Module. Thank you.
Best way is by finding it on the manufacturer spec sheet. If you don't have this, you will need to measure at the point between where two gears mesh. Hope this makes sense. This will be difficult to measure with a caliper or measuring tape... I highly recommend getting this from the manufacturer.
Excellent presentation 👌! Can I use this fusion 360 script to make sprocket for tank tracks how can you calculate sprocket pitch using holes distance between tank tracks
Hello Glen, Yes! This is possible but may take some trial and error to get right. It is mostly a tool for creating meshing gears. I would see if there is a sprocket tool first. I really like this plug-in because it is simple to use and effective.
@@AvivMakesRobots likely there is a 'roller chain' generator, like in Inventor. You'd specify your own 'chain' (the tank tread) and your own sprockets, including any number of idler gears (all the in-between wheels on the ground inside a tank tread)
All 3 wizards are a challenge to use (spur gears, belts/pulleys, roller chain/sprockets) but they do work, both Inventor and Fusion have this.
Please what's the of the software
Fusion360
i do not understand where is this theoretical cangent point on radius on green line, becouse on radius it may be anywhere. whatewer its looks like this angle changes width of upper part of tooth
I understand your question about the green line: The green line is tangent to the inner circle of the gear. That is why the green line can't just... be anywhere along the radius.
So first point for green line: tangent to inner circle
second point for green line: perpendicular to top arc of tooth.
@@AvivMakesRobots here its shown quite good th-cam.com/video/NF8fpuczU5I/w-d-xo.html
Very helpful video!
How could one actually measure pressure angle on an existing item, like the spline of a differential axle? Naturally, it's much harder in the flesh with such a small pitch gear part.
The best way to do this is to first 3d scan it. If you can't 3d scan it, the second best thing to do is to lay it flat and scan it with a paper scanner, or to make an ink print. From there, it is a matter of using the right tools to get an estimate... remember, there are common pressure angles like 20 degrees and 14.5 degrees. It is probably one of these.
@@AvivMakesRobots Good advice, thanks mate. Yep used in this diff is either 30 or 45 degree. I've chosen 45 degree for the differential centre, however on the outer wheel hub there is a female splined driven gear (as the axle is floating, and goes inside this to turn the spindle / hub / wheel) that is kept captive inside the hub. Don't want to pull apart the whole hub to remove it so the ink print is a fantastic idea!!!
@@dons1932 Great! Happy I could help!
It would be immeasurably more helpful if the gear diagrams were drawn to scale of their respective pressure angles. Simply dimensioning the same gear differently makes this exceedingly difficult to follow.
I understand what you are saying. Since I did not, an easy way to visualize is to click between different pressure angles when in the gear generator tool and to look closely at the teeth changing. You will see the radius of the tooth changing to be either smaller or larger and it will be abundantly clear.
Can you do a video on cycloidal gears please?
Hi Me Me, thank you for this suggestion! I will definitely take a look at them and see if I can make a video for them.
At 1:55, the LH and RH geometries look identical. All that appears changed are the numbers: 14.5 and 25 degrees.
Yes, these are example graphics. Once the gear is generated at that pressure angle, it will be visible in both the preview and when meshed with a compatible gear.
@@AvivMakesRobots Thanks for taking the trouble to explain that.
@@danielwalker5682 Sure!
The green line is not a tangent. There are no arcs in a spur gear profile. It is an involute curve. The pressure angle is not what you define. It is the angle between the line between the mating gears centers and a line tangent to the involute curve at the point of contact between each gear.
It is, for the sake of argument, the best way I have found to explain it.
@@AvivMakesRobots Then you lose that argument. There is no value in describing it incorrectly.
worst explanation I have ever run into.
Why is that?