Made a gear cutter from scrap

alb

alb

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This was an old cast iron boss from a lawn mower
Being Scottish I hate thing going to waste ;-)

Alb
 
Good going... You'll be hooked now, gears are fun.


Ray
 
Did you purchase the cutter or did you make it? If you made it, I'd like to hear how you did it.

Walt
 
Thanks All,

This cutter was made from an old cast iron boss that was cut off a lawn mower (the end of the shaft that holds the blade on)
I just turned it down to a nice finish then milled out the slot for a 6mm cutter then milled a flat so I could get the three clamping screws in
But I am going to make another out of a harder steel c45 I am a bit worried that the cast iron may be a bit brittle
I will get a build log on the next adventure

Thanks
Alb
 
Nice work!

The 6mm cutter though, did you grind it? If so, how did you determine the geometry? If not, where did you purchase it?

Walt
 
Walt
No I just ground it on the bench grinder green grit wheel and used a old gear for reference
Not very technical I know but if it works don't knock it :)

Alb
 
alb said:
Walt
No I just ground it on the bench grinder green grit wheel and used a old gear for reference
Not very technical I know but if it works don't knock it :)

Alb
Click to expand...

Is the cutter bit carbide?
 
I have made flycutters many times to make gears that I did not have a "real" cutter for; one thing is that if you grind a cutter from another gear as a sample for the form, it should have a number of teeth fairly close to the number of teeth to be cut; a good guide as to how close the sample should be to the number of teeth to be cut is the range of numbers of teeth for a regular set of single tooth gear cutters; the lower of number of teeth, the more important this is, as the form of the teeth changes much more radically at the minimum numbers of teeth, and less as the numbers increase.
Carbide would be my last choice for a cutting tool for this purpose.
 
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