Hobbing a Spur Gear & Pinion
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- Опубліковано 16 чер 2024
- We demonstrate the Hobbing process to make gears. The simultaneous rotary motion of the gear blank and the Hob (Cutting Tool) generates the Involute gear tooth form. While there are other methods such as milling and shaping, hobbing has a clear... bit.ly/3onfQon
advantage in terms of speed and accuracy. No wonder probably 80% of modern torque transmitting gears are hobbed.
Last minute timing for Gears for Makers:Come to Ventura and make gears with me for a day:
• Gears for Makers
Chapters
00:00 The Process
00:59 Blank Processing
03:42 Keyway Broaching
04:20 Index Change Gears
05:32 Pinion
06:16 Pinion Working Depth
06:20 Pinion Hobbing
06:59 Pinion Scallops
07:12 Gear Hobbing
07:40 Generating the Involute
08:42 Center Distance
08:52 Gear Scallops
For every rotation of the Hob - the work (gear blank) will rotate one tooth space. 1-thread hob.
For every rotation of the Hob - the work (gear blank) will rotate two tooth spaces. 2-thread hob.
For every rotation of the Hob - the work (gear blank) will rotate x tooth spaces. X-thread hob.
The MATH: (YEP FREE CALCULATORS TO KEEP IT EASY)
To process a gear with hobbing there are very few things you MUST know; (INPUTS)
1) The # of Teeth in your Gear(s)
2) The pitch or module of the gear teeth
3) The Pressure Angle
Click below to calculate the gear blank size from the inputs;
bit.ly/2Ld6eOH
To setup your hobber you must match the ratio of the machine to your change gears;
bit.ly/3BJXHs9
You BUY/RENT the cutting hob and the involute shape and pressure angle are already in the cutter;
bit.ly/3fH58a4
Follow the Machine Tool Manufacturers instructions to setup the machine and adjust for the lead angle. Click below to see how our Pfauter RS00 is setup;
• Involute Hob for Gear ...
Hob the gear and then do the QA/QC work to measure the gear. Using the MOP calculator you can check you gear and make adjustments to your process until you have the pitch line just right. All based on the inputs above. You can also make modified profiles if you are more advanced and lower gear noise.
bit.ly/3opQyWB
Measure the Center Distance and mount the gears in your new transmission;
bit.ly/3jQt2kv
Manual Equipment Used
Okuma LS Lathe, Capable of many normal engine lathe operations and also includes pitch and module threading capability that is useful for making Worms, and Hobs.
Equipped with a 6-Jaw Pratt-Burnerd chuck, Swiss Multifix QC toolholder, Koolmist, VFD to manage speeds more accurately and provide some novel additional capability.
DuMont press, broach and bushing sets.
Pfauter RS00 Hobbing Machines circa 1950 & 1970. Electronics rewired with PLC system and a few lines of code to replace the relay logic of the original system(that you cannot find parts for).
Yes, we do have a CNC lathe for large count precise gear jobs. We have 4 Pfauter RS00 machines giving us good capacity, along with shapers and bevel gear machines. Give us a try, send us an RFQ. If you look closely we used two different hobbers in this video, one processed the gear and the other the pinion. 2-Machines finishes a job quicker, and lets you check both gears with MOP and in-mesh to make fine adjustments. Parallel processing gears is cool.
bit.ly/3sb4qHb
Hobbing Defined on Wikipedia
bit.ly/36KLZiT
History of the Original Hobbing Machine
bit.ly/35hBaUM
Includes a free download of the following
1) Full copy of the Sciele Patent with Drawings (1856)
2) Fully copy of the Pfauter Patent (1900)
3) Pfauter Hobbing (1976)
If you have a lathe get a mill
If you have a mill get a lathe
If you have both get a hobber
Evolvent ROCKS
Involutes ROLL
Please SUBSCRIBE 🔔 We have developed useful content to help the machinist community with gears and gear machine tools. With our free resources centered around skills/tools/knowledge, you are now enabled to make any high quality gear you would ever need.
The history of gears is surprisingly interesting - the process of milling and hobbing gears plus the transmission of torque and movement all find a place here. We will open the "Secret Gear Case" to YT as well through this channel - a personal mission
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To learn about lubricants for your machines
oilviscositychart.com
/ villagehobber
Disclaimer:
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great video, ive always loved gear hobbers but could never really find a decent video that has a clean and concise walk through of the process. you guys got another subscriber.
Glad you liked it!
Thanks Andrew. I took a couple short videos with my phone to show family and friends what I learned at the Evolvent Gear School. Now I can show them this video which demonstrates the process in a much clearer way.
Naburian Rocks!!!
Norm in Arizona
That is awesome!
This was great. Thank you!
Glad you enjoyed it! Stay cool in AZ
Beautiful and very informative. Thanks a million
My pleasure!
Nice video, you have a wonderful approach teaching.
Please also mention that we have to set the helix angle 2deg43mn of the hub so the tooth are strait
Great tip!
Please make a video on spiral bevel gears
Hello Andrew,
Cool video, I enjoyed it very much, thank you.
Take care.
Paul,,
Glad you enjoyed it
At the beginning I thought it seems a Pfauter and it is! 👍👍
Yep, we are full of Pfauters over here. Are you part of PfauterNation too?
Hi, well done and explained the process many youth should need to learn these processes, envelope arrived opens live in an up coming video. We are enjoying your videos learning a lot love watching the machines making those gears. Hey those buy/rent hobs, can those hob tool cutters be re-sharpened? Thank you, Lance & Patrick.
Glad you liked it. YES, you can resharpen the hobs and if you slide them on the hob arbor between batches of gears you can even out their wear.
Hey! Thanks for answering my question on machine constant it helped a lot. Do you have any resources on figuring out feeds and speeds for cutting a gear based off of material. For instance what feeds and speeds to cut a gear out of 4130 or 4340 steel.
There are not many resources out there and I it would have a lot to do with the hob material and coatings. The main manufacturers of Hobs are Tru-Volute (Japan), Star Su (China) , Gleason (NY). Since there are very focused gear shops for very specific materials etc, I am sure they are optimized, but they have no need to share with others. Stay tuned on this one as we are gathering this data ourselves. The range for steels is pretty big at 65-115 ft/min for the older HSS like M2 and M4-M42 hobs. Basically, the newer hobs have coatings that really extend the life of the cutters. Usually they require higher cutting speeds++. If you find anything please let the channel know. Great Question.
Can you explain full concept including calculation and and setting up.....
Great work.. Can I make a 23 tooth gear differentially without using the number 23 or its multiples?
23 is a prime number - probably not
Do you also hob timing belt pulleys? I was wondering if there are GT2 timing belt hobs available.
Yes, familiar with the Power Grip GT hobs from 2mm up to 5mm sizes. Would need to check on GT2. Send me an email ....
How do i figure out machine constant if it is not listed in my manuals.
Watch this
ua-cam.com/users/shortsvXuO0fzb-YY?feature=share
could you guys do a video about the choice of material used? Like what type of steel to use based on what kind of application. when and why you would use a certain type of steel? when hardened and ground gears would come into play? one last thing, how hard of a steel could you cut with a hobber? Could you possibly cut a gear with a hardness of anywhere around 40-50 rockwell? or is that where grinding comes into play? thank you.
Great question - I will put it on the list. Generally, the hob bits are used on annealed alloy steels. Anything too hard and it can damage the bit.
From a process standpoint to achieve a very hard high precision gear there are many steps. On the metallurgy side ONE method/alloy is to
1) hob annealed 4140 at RC32 yield strength is already high at 130,000psi with (stock to leave)
2) harden to RC 52 (yield rises to 219700 psi with proper processing)
3) Grind final involute profile to tolerance
A few interesting topics on materials are strength and also how repeatable the process is in the hardening phase, how deep to harded etc.
Skiving is another process altogether an can be done on hardened materials. Check out Gleason-
www.gleason.com/en/products/machines/cylindrical/power-skiving/the-gleason-power-skiving-approach
@@EvolventDesign thank you very much :)
can you mayby do a video of testing the gear? like run out and how you measure if a gear can meet the specifications of like a class 10 gear for example?
We use a Vari-Roll system for our spur and helical gears, and a similar gear rolling mechanism for our bevel gears. AGMA old 10 or AGMA new 10? Sure I can post this one fairly soon. Thank you for your interest and watching.
@@EvolventDesign it doesnt matter, what ever is convenient for you. thank you very much.
What a hobbing good video!!!
Thanks for watching Danny. I appreciate your consistent views and comments.
How about a worm gear and wheel?
The video is "on the list", the worm can be made in our Okuma or other lathe that can be setup or programmed to cut a diametral or circular pitch. The worm gear can be made on any of our hobbers either with a single flycyutter, or with a worm hob.
Here's how we re-sharpen those hob cutters with wire EDM
ua-cam.com/video/waRB6W0Ypmk/v-deo.html
Sir I am working on hobbing machine but I can't figure out what to cut helical gear please help me please sir I want to learn calculation
We are working on this for a future video.
How many gears should be set for hobbing machine ratio 24
115 teeth cutting
Use our calculator
evolventdesign.com/pages/change-gear-calculator
ua-cam.com/video/VlqObNS9dLA/v-deo.html
Hello sir
I want to know more about the data can you help me out here please?
Sure-send me an email
@@EvolventDesign Can I get your email id? So that we can converse
@@nachikachoriya4242 look here
evolventdesign.com/pages/contact
Also
instagram.com/p/CVTV6pqFD0i/?
Also for calculators
evolventdesign.com/pages/resources
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