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;
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To setup your hobber you must match the ratio of the machine to your change gears;
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You BUY/RENT the cutting hob and the involute shape and pressure angle are already in the cutter;
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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.
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Measure the Center Distance and mount the gears in your new transmission;
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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.
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Hobbing Defined on Wikipedia
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History of the Original Hobbing Machine
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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
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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
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