Select a cutter for making gears
ฝัง
- เผยแพร่เมื่อ 14 มิ.ย. 2024
- This is my attempt at explaining how to choose the right cutter for making gears. I basically cover diametral pitch, module, and how to find the correct depth of cut for making gears. All of the information can be found in machinery's handbook.
- แนวปฏิบัติและการใช้ชีวิต
Very well explained. Great Video. I've been selling cutters for 40 years and finally I better understand the ratios . A big thank you.
Fantastic video. I have been trying for such a long time to understand gear cutters, and this video made things so much clearer.
Thank you for sharing your knowledge, and presenting it in a way that anybody can understand.
Thank you for the best explanation of gear cutting that I have seen. You are a wonderful teacher.
I don't usually like "blind leading the blind" how to videos, but i found this incredibly amusing. 😅
I would also direct viewers to "that lazy machinist" for gear cutting info. (actually on just about any machining topic, as he is simply one of the best instructors on youtube.)
+radius north Agreed, he is one smart dude.
Best Gear Cutting instruction I have found. Answered all my questions. Thank you...👍
Thank you. Just trying to keep it simple and straight forward.
THANK YOU, someone who makes a video and describes everything in layman's terms...now just have to convert all of that into metric. 😊😊
Glad you found it helpful.
I thought you did a great job.
Gear cutting for dummies made simple.
I like the added bonus of converting your module gear to Merican
The interesting subject accompanied by a clear explanation makes for a great video, thank you!
+Maikel Versantvoort Thanks.
Hey, that was a fantastic introduction. Thank you very much for your time and effort.
Cheers, Dave (from Downunder)
+David Harper Thanks for watching. Hope the content is helpful.
Thanks for the great explanation! Now I get it! Calculating gears is more complex than I expected, but manageable. Now I can do it and know where to look for reference digits.
Interesting! Finally I know what module means. Thanks for the vid. Very hepful
Thank you so much...this was so helpful. Have a great Christmas...in these troubling times. Just subscribed.
Wow. I've been trying to understand all those things about gear cutting and could not get much of it through my head. Your excellent video just really helped out! Thanks for a great explanation. I think I better go check out your other videos.
Glad it helped. Thanks for the feedback.
thanks man. this is a best explanation on 'module' what ive seen
Nice job of breaking it down. I don't know if I'll need to cut a gear, but I know where to turn if I do. Thanks!
Great explantion.We manufacture gear cutters and my customers can use this information.
Maxwell Tools Company
Thanks!
For a newbie, this was priceless! Thank you!
Inspirational, now I need to find used cutters.
This was great... never new these cutters existed. You did a fine job with this algebraic formulas man! Would love a follow up showing you making complete working gears
+Vintage Wood Workshop Yeah, those cutters are really handy. Thanks for watching.
many thanks for unravelling a lot of jargon
Great explanation, thanks for your time.
Thanks. Hope it helps.
HUGE help! thanks for that!
Thank you!! Great video
VERY well done
I too struggled with math. Algebra to be exact. Then came trigonometry for machine trades shop. I was totally lost with that one. How I passed that class, amazes me.
That was awesome sir. Tks
Great tutorial. I too have added this video to my computer library.There are many very smart people out there but very few know how to teach. You did a great job here.When I was in school learning my trade it was explained to me that DP or diametrical pitch meant the number of teeth per inch of the gear diameter. In other words a 6DP gear meant there were 6 teeth for every inch of the gear diameter. Count the teeth on your gear and divide by the diameter -- that's your DP number. I believe that is correct and if not then straighten me out LOL.Once again -- great job.
Thank you. I appreciate that feedback, it lets me know that I'm doing something right!!
Ahhh..... no DP is the number of teeth(or the number of tooth pitches) on the circumference of a gear 1'' in diameter. DP= N/OD example......a 30 tooth gear divided by 1'' dia. blank equals 30 (DP) a 60 tooth gear divided by a 2'' dia. blank equals 30 (DP)
Also OD=N/DP This is the relationship to explain DP using the pitch circle of gears, think of two disks touching and rubbing together, without teeth......if you want to cut a blank for a gear(which must be a larger dia. than the blank disks) then you must add the addendum factor.....which is always 2, when using the involute tooth form. There are other tooth forms such as the cyclodial form where the addendum factors are different.
@@thebaron44 Close but no cigar DP is not equal to number of teeth divided by outside diameter. It is equal to number of teeth divided by pitch diameter. Pitch diameter is the point where the Addendum and Dedendum meet on the gear tooth. If you want to use OD of gear you add 2 to the number of teeth then divide by OD ( DP=N+2/OD )
@@nickk3863 You are correct in my hurry I forgot to add the 2 to the N
Thanks so much you were big help
Very helpful! Thanks.
That was to the point, thanks.
thanks, great help
Thanks for the video and explaining with a novice in mind.
No problem.
Iam one step closer to cutting my Owen gears. Thanks that help a lot. By the way your video’s are great 👍 thanks
Good job
The module is no longer a secret. I went to a metal workshop and the mill worker easily told me how to decide the proper module number for the gear you want to work on. It's simply like this😁:
(Number of teeth + 2) divided by the diameter.
I showed him a 62mm diameter 60 tooth gear. He immediately told me that I need a cutter from Module# 1 in order to make a new one.
I hope this helps.
Thank you for sharing.
Good vid Thanks
You're the man.
Vraiment merci beaucoup pour tout!!!.
I'm adding this to my video library.
New to gear cutting. Need all the training I can get. Lol
If you don't already have it, pick up a copy of Machinery's Handbook. It's got everything you need. Thanks for adding this to your list.
Somehow I got the feeling you don't like the metric system as much as the imperial ;-).
I still hope that someday (not to long) the USA will switch ti the metric system....that would make life so much easier :-).
The metric system is by far simpler and in my understanding more coherent ;-).
But thank you for the video, it was really informative and helpful!!!
Enjoyed.
This helpful..
Can we use 135 to rack cutter to cut 60 teeth????
OD=133
TEETH=40
DEPTH OF CUT=7mmm
which cutter should i prefer for cutting spur gear
P6M5 is a grade of High speed steel I believe.Probably in Eastern Europe
Russian actually. Read as R6M5. Basically just regular HSS steel
Hell yeah man, thanks for the idiots basic guide to gear making. The next stop, the big book of scariness lol.
Thanks for making awesome content.
+dj berg Exactly, I have to break it down into basic steps or it doesn't compute. Always appreciate the support, thanks for watching.
sir I know OD and Number of teeth and depth of cut of teeth of to be produce on workpiece, how can I select the cutter
What is the difference between DP16 cutters and P20 M1, M2 M3 etc and how can we see the cut of the cutter
7:07 is the material of the cutting tool: Steel P6M5 (Russian grade)
Every Diametral pitch has eight cutters. You use the one for the number of teeth your cutting for that gear no1 for 12-13 teeth no2 14-16 for teeth no3 for 17-20 teeth no4 for 21-25 teeth ect.. ect. up to no8 for over 135 teeth. The P is for Pressure Angle, (PA) on SEA or American gears. The two most common in American gears is 14.5 and 20 degree. any gear after 1980 is most likely 20 degree Pressure Angle but there are specialty gears that are any number of PA
According to 'Machinery's Handbook', a #1 cutter is 135 to rack and a #8 is 12 to 13 teeth
OD=133
TEETH=40
DEPTH OF CUT=7mmm
which cutter should i prefer for cutting spur gear
DP is not equal to number of teeth divided by outside diameter. It is equal to number of teeth divided by pitch diameter. Pitch diameter is the point where the Addendum and Dedendum meet on the gear tooth. If you want to use OD of gear you add 2 to the number of teeth then divide by OD ( DP=N+2/OD )
DP=N+2/OD OD=N+2/DP N=(DPxOD)-2 Yes if you want to use the pitch diameter then don't use 2 which is the addendum factor. As shown in this video, you don't need the pitch diameter to calculate or cut a gear.
Thanks
It would be helpful to know how to measure the pressure angle of the gear so that you order the correct gear cutter. 20 degree is most common these days but years ago 14.5 degree pressure angle gears were the norm. Industrial suppliers like Travers Tool Company keep both in stock. The cutters are about $60 each, a lot more than the mystery cutters on ebay, but at least you will have the correct cutter for the gear you are making.
I use the three/four tooth measurement method. Carefully measure over three gear teeth with calipers. Then calculate: (3 tooth value) + { [ cosine(pressure angle) x Pi] / Diametral Pitch}
If this is within 0.001" or 0.002" of the measurement over four teeth you picked the correct pressure angle. The difference between 14.5 and 20 degree pressure angles will only be ~0.005" so measure as close as you can.
There is an additional clearance amount to be added to the calculated depth of cut. That is shown on the gear calculations table he used in the video. It's not much, usually just a few thousandths of an inch to make sure there is clearance when the teeth are meshed.
Cheers from NC/USA
Makes perfect sense except, we start for senter distance and gear ratio and then choose an appropriate cutter.
Good discussion now how do I set up a spiral cut on my universal mill. Centering the cutter is the tricky part. Lol
+Chris Anderson No problem use this rule next time, "Looks good from my house."
ThunderDog lol somehow I don't think that work
It’s nice when we just plug the numbers into our cad file and set up the tool in cam path and the turn mill will take care of the rest. Otherwise we load round bar into the barber Colman and use correct change gears. Sounds like a coin machine dropping gears one after the other.
Nice vid Thunder. would you happen to know the whereabouts of a set of 22DP with a 20 PA cutters?
+Charlie Romeo I'm not brushing you off, but I would just check eBay. My set was an offshore purchase.
banggood . com this is a chineese site that sells machineing stuff as well as lots more stuff.
Jamie Buckley Will give it a shot. I'm learning however, 22DP is hard to find, especially with. 20 deg PA. I will keep looking though. Thanks for suggestion.
From what I can make out the DP is the width of the tooth cog end on a correctly cut gear.
20 DP would be 1/20th of an inch wide so a smaller DP number is bigger.
Module 1 would be 1mm wide and a larger number would be bigger.
Anybody please correct me If I'm wrong.
Ahhhhh no, DP is a ratio between the pitch diameter and the number of teeth on the wheel.
The width of a tooth on a 20 DP gear can be found by dividing 3.1416 by the diametral pitch. This gives the circular pitch, the width of a tooth and a space, divide by 2 and you have the tooth width.
This guy is my teacher
Great video!! How did the gear work out???
Like a champ! Thanks for the positive feedback.
@@ThunderDog No, thank you for the time and effort!
Thanks 🙏🏻
I am new for making gears…
Where did u get (25.4) from??
hi, did you ever find out how he got the 25.4 also I needed to know once he got the 25.4 how did he get to the 28.22 any help appreciated
25.4mm per inch.
My biggest hurdle is understanding the statements. In one- it is said N+2 divided by diameter= DP. In another, N divided by pitch diameter= DP.
I'm guessing the first means the N + 2 / total outside diameter (Not pitch diameter) ? argg
Yes......OD...when two gears mesh of whatever tooth count...they mesh at the pitch circle...this is calculated along with center distance. You cannot measure pitch diameter...it can be calculated......to cut a gear you only need the number of teeth, then OD of the blank is calculated and cutting depth. The 2 factor only applies to the involute tooth form......what? you mean there are other tooth forms...yes such as cyclodial clocks and watches use this form.
Olá tem esse livro em português Brazil
Hey I suck at math also. That is what online calculator and converters are for right?
Finely we are what is the madoule.
How you got the 28.22 please explain thanks ? And from where is the DP 25,4 number.
It's a module 0.9 which is 28.22 diametral pitch. See 8:00 of this video. Hope that helps.
@@ThunderDog Hi thanks so 28.22 is the diameter of the module if i understand,and the other number the 25.4 how you get it from what? Waiting your answer thanks.
@@jozsefienciu2325 25.4 is apart of an equation which is found in the Machinery Handbook. It's one of the Machinery Handbook rules/equations to convert from module to diametral pitch.
@@ThunderDog Thanks a lot.
Metric is so much easier to work with. You don’t have things like fractional, number and letter sizes of drills for example.
I’m from the UK, and was born in 1957. I’m really from the last generation that started to learn imperial, and then had to change to SI metric units at about the time that I went up to secondary school. Very glad about that, still have to use imperial units for odd Things, but as seldom as possible.
I have in front of me a box of carbons for arc lamps; they’re marked ‘ Link LP 12 mm x 8 in Low intensity positive. Does that make any sense to anyone? Carbons were always like that, metric diameter x imperial length as far back as I can remember. Sadly, carbon arc lamps in any form are rare now.
What's the name of that book I want that book please help me?
Machinery's Handbook
p6m5 is like m2 hss steel type. Just that.
ThunderDog, you keep saying you suck at math. If it was the1960's you would have a problem. Since its the age of computers. You don't need to know math. Just look your math problem up on your computer. Also I know this is America but Metric is way easier than SAE. They make the same 8 cutters in Metric. The difference between Pitch and Module is absolutely nothing. It's the distance from center of one tooth to the center of the next tooth. Love your videos, keep up the good work, Rusty
hahaha ratio... scares me hahaha. Tank you for this video
...I found a little box of metal things with some writing on them.....I'll go have a beer...OK, I'm back.....those dern things still here?...I go git me a book..
ありがとうございました先生
Nice video but please don't let the cutters bang into each other. They need to see some love.
formulas are different across some books !!! does that matter ???
Not sure of what references you're referring to.
@@ThunderDog
Machinery’s
Handbook
30th Edition
BY ERIK OBERG, FRANKLIN D. JONES,
HOLBROOK L. HORTON, AND HENRY H. RYFFEL
Ok, so you have a broken gear, you know the number of teeth, that's easy enough, how do you identify which module it is?
You need to measure the OD and count the number of teeth. (metric mm) Module=OD/N+2 (inch)(DP=N+2/OD inch and mm are treated differently
Always trust a guy with a blood blister on his thumb.
P6M5 it's steel grade marking (russian R6M5) link: www.splav-kharkov.com/en/e_mat_start.php?name_id=600
Hello sir
'I'm American'. So...
So you have trouble with multiplying by ten?
First thing you need to know is how to treat your tools.
Nobody sucks at math as bad as I do nobody. it's really weird with me if I read something I understand it I can do the math and then buy the next day I don't know how to do it anymore
Doesnt make sence...the tooth size, pitch, depth is always the same if you use the same set of gears only the gear diameter is different. so one cutter should fit them all. same like a bike chain.
No......there are a set of 8 cutters per DP or module system....one cutter will not cut every tooth size. A 12 tooth cutter cuts a wider space and a narrower tooth width than a cutter that cuts 134 teeth, a NO.8 cutter.
A problem with this video...one should not mesh DP gears and module......they are based on different measuring systems, think inch or mm then use the proper system and cutter. No one cuts one gear it always meshes with another gear, module and DP gears never are the same.
Agreed. I don't think I said DP should be mixed with module. To the best of my knowledge module is similar to DP. To be clear, all gears in a gear train should be of the same DP or of the same module. Again, this is my limited hobby experience.
@@ThunderDog You are correct they are similar ....because of one being metric and the other inch ...one is multiplied and the other divided....you have good experience and a good video.
Thanks from another 'Merican who also sucks at math.
learn metrique because it's better I have a mercan passport and I still love metrique ;)
+ITM Samian Not gonna lie it is faster to calculate with metric, but I still struggle with judging any distances in metric.
its the same as ever comment section. no I understand still have no idea what a foot is roughly. 12 of those other ones
+ITM Samian Yup.
I came here hoping. to understand gear measurement. All you did was - meh, I hate it. I don't get it.
Rather try to understand how things work, than follow a recipe.
Great video but you (and pardon me) you babble too much. Example is in the beginning when you had all the cutters in the box and were just going on and on. But you did help me. Thank you.