Been reading an engineering book on gear designs, and it would seem like gear making is a seriously deep rabbit hole, lol! It is interesting to see how, as you show, the 14.5 vs 20 degree pressure angles are a generally geographic thing, but also interesting to see how each has its pros and cons. Thanks for sharing!
Have been in this rabbit hole for the past 6 months. If you think cutting a spur or helical gear is complicated, wait till you get into spiral bevels. Tooth grinding is another whole different level.
Late to the show but I'm certainly glad I ran across your channel. I have successfully cut a few gears but a rank amateur would best describe my expertise. I'm looking forward to watching and learning. Thank you for time and effort.
Glad the video helped. Use our gear generator to make a rack shape to measure your gears: evolventdesign.com/pages/spur-gear-generator It is a pretty good trick - put the .DXF file into your CAD software and print to scale. Paper or #D print and you have a gear template. Thank you for watching.
Hello, Question: On some gear hob cutters, I've noticed that the cutter will display a DP such as 8-10 or 20/26. What do the numbers mean and why is it written in this method?
@@EvolventDesign How do I interpret those numbers? I believe the first number in the example above is the diametral pitch (20) but what does the 26 mean? Thanks for the reply!
There are like 50 different sets of gear cutters out there how do you choose the right one for the tooth size that you're looking for there's no information on that. I know how to calculate diametral pitch pressure angle as it applies to making the gear within the set that you're working with I know how to apply all the math but how do you find the proper set??? For example for my life I choose to buy a set that is a 16 diametro pitch 14.5 pressure angle there are eight cutters in that set I know how to cut any gear on my legs based on that set they are all fairly small tooth gears is they're all interactable between each other but if I wanna make something with large gear teeth for extremely high torque how do I find out that information I can't find out that information anywhere
Check our newest calculator that is for gear strength. evolventdesign.com/pages/gear-strength-calculator If you have some idea of the horsepower you want to use, this little calculator is helpful for design. But all gearboxes are different and have different constraints. At least your gearbox will be strong enough. The reference for this calculator is Dudley, and you can probably find this old book on eBay other online source used for not much. It has a lot of gear design information.
The main objectives for gearboxes can be boiled down into one statement: Minimum Volume. Small compact, low noise, light weight, reliable are the usual design goals.
@@EvolventDesign I think my overall knowledge of engineering is lacking when it comes to this subject but my overall ability to get things done and accomplish in general is there a quiz to where I just need to see a graphic of what type of gears a certain cutter set with me where I could make an educated guess you know what I mean? For example if you've ever watch this old tonys videos where he makes his bar Bender or ring roller I think it's called and that you don't abuse his gears are closer to what I'm looking for then the set that I'm using that is more suitable for the drive system of a South Bend lathe... Unfortunately he never answers any questions I have never had him respond to one single question so I've given up even trying to ask him which said he used. I've tried to speak to Oh my God companies that sell these but they're pretty unreceptive unless you know exactly what you're talking about and I do not know exactly what I'm talking about I'm talking I'm a hobbyist level and they are looking to talk to fellow engineers so they look down on you. If I could only see a catalog that also shows examples of the finished years I would be in heaven
@@ClownWhisper it should be pretty clear if you watch ‘milling a gear 1 &2 for the process. Check our gear ‘strength calculator’ to get the pitch that is strong enough.
@@EvolventDesign but i have already check with 8 DP cutter pressure Angle 20° and 14.5° cutter with which my 2 teeth broken gear. But the cutter not match with it, instead 9 DP cutter match with it..
Been reading an engineering book on gear designs, and it would seem like gear making is a seriously deep rabbit hole, lol! It is interesting to see how, as you show, the 14.5 vs 20 degree pressure angles are a generally geographic thing, but also interesting to see how each has its pros and cons. Thanks for sharing!
Have been in this rabbit hole for the past 6 months. If you think cutting a spur or helical gear is complicated, wait till you get into spiral bevels. Tooth grinding is another whole different level.
Late to the show but I'm certainly glad I ran across your channel. I have successfully cut a few gears but a rank amateur would best describe my expertise. I'm looking forward to watching and learning. Thank you for time and effort.
Welcome aboard!
Hello Andrew,
Excellent video, packed with lots of useful information, thank you.
Take care.
Paul,,
Glad you enjoyed it
Excellent video and description !
Thank you very much!
Always informative Andrew thanks for the video.
You bet
This is fantastic! Thank you for sharing.
Glad it was helpful!
nice video, thanks for posting it!
Excellent video, my only criticism is what you refer to as the shoulder is actually the addendum.
Glad to know you are watching so closely, I will pay closer attention. Thanks
the pressure angle is a topic that few teachers teach in universities, unless you show to your teachers, a high vocation.....and brain, to get all.
Glad the video helped. Use our gear generator to make a rack shape to measure your gears: evolventdesign.com/pages/spur-gear-generator
It is a pretty good trick - put the .DXF file into your CAD software and print to scale. Paper or #D print and you have a gear template.
Thank you for watching.
@@EvolventDesign my deepest shows of appreciations!!🙏👍
Hello,
Question: On some gear hob cutters, I've noticed that the cutter will display a DP such as 8-10 or 20/26. What do the numbers mean and why is it written in this method?
That type of nomenclature is usually for splines or stub gears.
@@EvolventDesign How do I interpret those numbers? I believe the first number in the example above is the diametral pitch (20) but what does the 26 mean? Thanks for the reply!
There are like 50 different sets of gear cutters out there how do you choose the right one for the tooth size that you're looking for there's no information on that. I know how to calculate diametral pitch pressure angle as it applies to making the gear within the set that you're working with I know how to apply all the math but how do you find the proper set???
For example for my life I choose to buy a set that is a 16 diametro pitch 14.5 pressure angle there are eight cutters in that set I know how to cut any gear on my legs based on that set they are all fairly small tooth gears is they're all interactable between each other but if I wanna make something with large gear teeth for extremely high torque how do I find out that information I can't find out that information anywhere
Check our newest calculator that is for gear strength. evolventdesign.com/pages/gear-strength-calculator
If you have some idea of the horsepower you want to use, this little calculator is helpful for design. But all gearboxes are different and have different constraints. At least your gearbox will be strong enough. The reference for this calculator is Dudley, and you can probably find this old book on eBay other online source used for not much. It has a lot of gear design information.
The main objectives for gearboxes can be boiled down into one statement: Minimum Volume. Small compact, low noise, light weight, reliable are the usual design goals.
@@EvolventDesign I think my overall knowledge of engineering is lacking when it comes to this subject but my overall ability to get things done and accomplish in general is there a quiz to where I just need to see a graphic of what type of gears a certain cutter set with me where I could make an educated guess you know what I mean? For example if you've ever watch this old tonys videos where he makes his bar Bender or ring roller I think it's called and that you don't abuse his gears are closer to what I'm looking for then the set that I'm using that is more suitable for the drive system of a South Bend lathe...
Unfortunately he never answers any questions I have never had him respond to one single question so I've given up even trying to ask him which said he used. I've tried to speak to Oh my God companies that sell these but they're pretty unreceptive unless you know exactly what you're talking about and I do not know exactly what I'm talking about I'm talking I'm a hobbyist level and they are looking to talk to fellow engineers so they look down on you. If I could only see a catalog that also shows examples of the finished years I would be in heaven
@@ClownWhisper it should be pretty clear if you watch ‘milling a gear 1 &2 for the process. Check our gear ‘strength calculator’ to get the pitch that is strong enough.
THANK YOU , REGARDS R
Thanks for watching.
Sir how we know a gear is Module or DP system
Our next video will cover this topic. We do this frequently with repair gears that come to our shop.
Check our newest video-it should answer your question…. Thanks for watching
OD=133
TEETH=40
DEPTH OF CUT=7mmm
which cutter should i prefer for cutting spur gear
Numbers dont match exactly, but here is a close match
Inputs
Number of Teeth: 40
Diametral Pitch: 8
Pressure Angle: 20 degrees
Gear Type: External
Outputs
OD Reference: 133.3500 mm 5.2500 in
Pitch Diameter: 127.0000 mm 5.0000 in
Root Diameter: 119.0625 mm 4.6875 in
Addendum: 3.1750 mm 0.1250 in
Dedendum: 3.9688 mm 0.1563 in
Working Depth: 6.3500 mm 0.2500 in
Whole Depth: 7.1437 mm 0.2813 in
Circular Pitch: 9.9746 mm 0.3927 in
Tooth Thickness: 4.9873 mm 0.1963 in
Base Circle: 119.3410 mm 4.6985 in
Undercut: No
© 2023 Evolvent Design, 25-Jul-2023
evolventdesign.com/pages/blank-calc
This would use one of our 8DP cutters
GC-731, GC-739 or GC-747 depending on the bore and cutter diameter would work best in your machinery.
@@EvolventDesign but i have already check with 8 DP cutter pressure Angle 20° and 14.5° cutter with which my 2 teeth broken gear. But the cutter not match with it, instead 9 DP cutter match with it..
OK, here are those numbers - but it still does not look like a match. This may not be a standard gear.
Inputs
Number of Teeth: 40
Diametral Pitch: 9
Pressure Angle: 14.5 degrees
Gear Type: External
Outputs
OD Reference: 118.5333 mm 4.6667 in
Pitch Diameter: 112.8889 mm 4.4444 in
Root Diameter: 105.8333 mm 4.1667 in
Addendum: 2.8222 mm 0.1111 in
Dedendum: 3.5278 mm 0.1389 in
Working Depth: 5.6444 mm 0.2222 in
Whole Depth: 6.3500 mm 0.2500 in
Circular Pitch: 8.8663 mm 0.3491 in
Tooth Thickness: 4.4331 mm 0.1745 in
Base Circle: 109.2931 mm 4.3029 in
Undercut: No
© 2023 Evolvent Design, 31-Jul-2023
evolventdesign.com/pages/blank-calc