did anyone made a gear with his 3axis cnc

[max_imum2000]

i am currently building a new cnc with ballscrew, thk slides , servos , and everything to achive best accuracy i can get.
i was wondering will i be able to cut gears and pullies with my 3 axis machine ?
i mean to put a 5ml aluminum sheet (or plasitc) and gut the gear pattern on it so that the thickness of the gear will be the same as of the sheet
will that be possible with very small carbide bit for example ?

has anyone did it ?, please post pic if u did

thank u

[miljnor]

I have done sprockets (just another type of gear) so I don't see why you couldn't do it.

Definitaly not the fastes or best way to make gears but it will work.

Don't have any pictures but look at a motorcycle gear and that will give you an idea of what we made.

[keithorr]

I've downloaded dxf files from Boston Gear or somebody and cut delrin with a 3 axis and a 1/16" endmill. The problem is getting a long enough flute to make a thick enough gear. The smallest tooth gear I could make with a 1/16 mill was 16 pitch.

[miljnor]

if you had a 4th axis you could do it like a gear hobber does it. Although programing it would be a PITA.

[stuart]

go to gary's clock site for gears --just one example.

http://www.pathcom.com/~u1068740/pictures.html

[Servo Wizard]

MAX_IMUM,

Here's an example of cogg cutting. I made those on a 3 axis Bridgeport mill with a homemade indexer.

Servo

[ViperTX]

You should be able to make simple gears with your gantry style router....I would still opt at a minimum for hobbing the gears on a Bridgeport with the horizontal spindle or axis....however the Bridgeport people refer to that....(horizontal mill)....

[miljnor]

Here's an example of cogg cutting. I made those on a 3 axis Bridgeport mill with a homemade indexer.

hey servo wizard, could you explane that cut path a little and tell us what tooling you used?

Those are some VERY nicely done gears.

[chineguy]

Servo Wizard.
Very nice work. Looks like you know your stuff.

[Fireflowers]

I've seen chainrings being made for bicycles out of a 1 meter lenth of aluminium round bar. The whole bar was hobbed then the rings were sliced off with a horizontal band saw and finished machined on a cnc machine centre!!

[max_imum2000]

servo wizard
was that a 3 axis machine !!!!
job well done .
please share it with us
how did u do it
and if you can publish a plans for your indexer
and how the tool path work and so we will all kiss ur hands

[Servo Wizard]

miljnor,

The tool path cuts multiple coggs with a woodruff type cutter with a convex radius. You can see that the indexer wheel has fewer posititions than the number of teeth on any given sprocket along with an index that is uncommon to the others. The limiting factor for the number of coggs cut per index position was the cutter shank contacting the sprocket. Bear in mind when you view the tool path that the cutter was .875" in diameter so the tool path had to be offset.

The indexer is actually more interesting then the sprockets. It is interfaced with pneumatics and one electric solenoid valve. Let's see if any one can figure out how one solenoid valve causes the detent pin to retract and then actuate the pneumatic cylinder that rotates the index wheel.

Servo