Can anyone confirm, or tell me how to space the teeth when machining a rack (as in a rack for a rack and pinion gear)?
I need to cut a rack and matching gear in 4DP
In the free Google Book download of Cincinnati’s A Treatise on Milling and Milling Machines page 262 says to space the first tooth turn the crank 3 times plus 35 thousandths. Not having a Cincinnati mill, I am not sure how much a full turn of the hand-wheel will move the table. Is it 100 thousandths per full turn? Making the spacing 3 hundred and thirty-five thousandths?
The project is to make a “kinetic” log splitter. My daughter purchased a DR Rapidfire Split log splitter http://www.drpower.com/power-equipment/log-splitters/rapidfire-splitter/prompt-for-rapidfire-3-hp-ms-new---web.axd , It looks like a pretty simple design that can be duplicated for a lot less than $1,300.
A quick YouTube search turned up this excellent up-scaled version
The maker provided the Martin Gear part numbers for his splitter. The pinion gear is Martin Gear’s #S415 a 4dp, 4-1/2” OD 15 tooth, with a 2” face. ($166 on Amazon) and Martin Gear’s R4x4 rack 2” x 2” is $447. At those prices you might as well as buy a complete DR Rapidfire.
I picked up the material for the rack last spring, and just scored a complete 4dp gear cutting set of 8 on ebay. A visit to Metals Supermarket and found a 6” round of 8620 for the gear. So far I’ve got $49 in materials, plus $120 for the set of gear cutters. I still need a 4” by 6’ H-beam, some scrap plate to hold it all together and a cheap HF engine to run it.
Mike
I need to cut a rack and matching gear in 4DP
In the free Google Book download of Cincinnati’s A Treatise on Milling and Milling Machines page 262 says to space the first tooth turn the crank 3 times plus 35 thousandths. Not having a Cincinnati mill, I am not sure how much a full turn of the hand-wheel will move the table. Is it 100 thousandths per full turn? Making the spacing 3 hundred and thirty-five thousandths?
The project is to make a “kinetic” log splitter. My daughter purchased a DR Rapidfire Split log splitter http://www.drpower.com/power-equipment/log-splitters/rapidfire-splitter/prompt-for-rapidfire-3-hp-ms-new---web.axd , It looks like a pretty simple design that can be duplicated for a lot less than $1,300.
A quick YouTube search turned up this excellent up-scaled version
The maker provided the Martin Gear part numbers for his splitter. The pinion gear is Martin Gear’s #S415 a 4dp, 4-1/2” OD 15 tooth, with a 2” face. ($166 on Amazon) and Martin Gear’s R4x4 rack 2” x 2” is $447. At those prices you might as well as buy a complete DR Rapidfire.
I picked up the material for the rack last spring, and just scored a complete 4dp gear cutting set of 8 on ebay. A visit to Metals Supermarket and found a 6” round of 8620 for the gear. So far I’ve got $49 in materials, plus $120 for the set of gear cutters. I still need a 4” by 6’ H-beam, some scrap plate to hold it all together and a cheap HF engine to run it.
Mike