Not much out there on these machines, I'm afraid.  If you know of any web sites with any information on this hobber, please email me.

Resources

• Division ratios, find out what divides into the number of your choice.
• Prime numbers and their relevance to gear hobbing.
• Software for calculating ratios used in gear hobbing.

Links

• Ash Gear manufacture a large variety of hobs, broaches and cutters from stock, with specials available to order.
• College Engineering Services produce a set of castings for the machine which I understand was much improved and called the "Helix".  It uses iron castings for the major parts and the base.
• mwmills2 Yahoo! group has various plans for gear cutting machines including the Jacobs Hobber.

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Warning: These pages consist of images and descriptions of equipment which can reach high temperatures creating hazardous and potentially dangerous situations.  These pages should not be taken as a step by step guide on how to construct any items or carry out any particular procedure, nor should any references to safety contained herein be taken to guarantee safety in all situations.