RunRyder RC
 14  Topic Subscribe
WATCH  2 pages [ <<    <     1     ( 2 )    >    >> ] 1194 views POST REPLY
AlignRC Thunder Power RC
jjeaster222000

Veteran

Bedford in

My Posts: All  Forum  Topic

that is just awesome!!

Team Synergy

08-17-2016 01:42 AM
PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
rctrooper1

Senior Heliman

Brownsville, Texas

My Posts: All  Forum  Topic

WOW!!!! amazing work!

Jz

08-25-2016 04:37 AM
PM  EMAIL  GALLERY  Attn:RR
prototype3a

Senior Heliman

Christiansburg,VA

My Posts: All  Forum  Topic

Where did you get the... hob?

~Drew

08-25-2016 03:39 PM
PM  EMAIL  GALLERY  Attn:RR
RM3

Elite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

its not a gear hob...its a gear cutter... several places sell the cutters (search "involute gear cutter" ) online... eitherway they are not cheap and the hobbs cost about 5 times more

Hobbs are spiral cutters designed for use in a gear cutting machine (or an advanced CNC mill with spindle feedback) and require that the gear being cut and the hobb rotate together at some given angle against each other... and thus produce a more "perfect" gear profile vs just using an involute cutter that can only cut a close approximation. One advantage of a Hobb is that one can be used to cut any number of teeth for its marked pitch size...BUT an involute cutter comes in numbered sets, each can only cut a certain number of teeth.

here is a cool video showing a model gear hobbing machine using one to cut a strait tooth gear

Watch at YouTube

showing a preference will only get you into trouble, 90% of everything is crap...

08-25-2016 04:24 PM
PM  EMAIL  GALLERY  Attn:RR
OuttaControl

Veteran

Springfield, Missouri -United states

My Posts: All  Forum  Topic

Hob video

Ram is the gear being cut advancing towards the cutter or is the distance between them changing? Or both?

Mine fall down, went BOOM!!

08-25-2016 04:58 PM
PM  EMAIL  GALLERY  Attn:RR
RM3

Elite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

On this particular hobber the depth of cut is already set... so the gear being cut is only being feed across the hobb.

showing a preference will only get you into trouble, 90% of everything is crap...

08-25-2016 07:29 PM
PM  EMAIL  GALLERY  Attn:RR
prototype3a

Senior Heliman

Christiansburg,VA

My Posts: All  Forum  Topic

I didn't think it was a hob but I really didn't know what it would be called. I've drawn helical gears in Solidworks so I think I understand why the cutter would have to be specific to both the module and number of teeth. It didn't occur to me that you would need a spindle encoder to run a hob but that makes sense too.

I've always wanted to see if I could machine a gear in 4 axis with a ball mill. I think if it was the same radius as the corner radius at the root of the tooth, it might just work but I'm betting it would be very time consuming.

~Drew

08-26-2016 12:00 PM
PM  EMAIL  GALLERY  Attn:RR
RM3

Elite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

I've always wanted to see if I could machine a gear in 4 axis with a ball mill.
This is actually being done already, but its being done on very very large industrial gears as any cutter (hobb or involute) would be cost prohibitive.

for smaller gears, the ball mill would have to be very small indeed, and the smaller they are the more you have to deal with significant deflection of the end mill itself thus limiting how much material you can remove per pass making the production by this method very very slow as you stated.

you could use solid carbide mico end-mills to reduce deflection, but they are relatively expensive and are very brittle, get the feeds and speeds even a tiny bit wrong or run into an inconsistency in the material being cut and they break (Ive done this enough times to know first hand)

BUT the advantage is that you could cut ANY pitch, ANY pressure angle and any tooth count by simply changing the code.

showing a preference will only get you into trouble, 90% of everything is crap...

08-26-2016 02:31 PM
PM  EMAIL  GALLERY  Attn:RR
prototype3a

Senior Heliman

Christiansburg,VA

My Posts: All  Forum  Topic

I used to pretty much exclusively run tools from 0.125" to 0.010". One of my favorites was a ~0.5" long 0.020" stub flute endmill. So, small tooling doesn't really scare me much. Though, the spindle on the Tormach I run these days would probably break those tools instantly with its runout. It doesn't really compare to a purpose built NSK spindle.

Harvey Tool, Kyocera and MA Ford FTW.

~Drew

08-26-2016 02:47 PM
PM  EMAIL  GALLERY  Attn:RR
mikmerl

Senior Heliman

Athens, Greece

My Posts: All  Forum  Topic

Very educational thread ..... well done.

Vario Bell 47g II, Vario EC135, Vario BO 105 big, Vario Benzin trainer, Logo 600SE, Logo 550

08-27-2016 05:40 PM
PM  EMAIL  GALLERY  Attn:RR
RM3

Elite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

thanks...I may make another video of a bottom frame for a Radical g20 being cut via CNC (sped up of course).

keep in mind CNC is only as good as the operator and the machine in which they operate.... Ive made some $hitty CNC parts before too... but those get thrown in the scrap bin as a lesson learned.

showing a preference will only get you into trouble, 90% of everything is crap...

08-27-2016 07:26 PM
PM  EMAIL  GALLERY  Attn:RR
WATCH  2 pages [ <<    <     1     ( 2 )    >    >> ] 1194 views POST REPLY
ProModeler Scorpion Power
 Print TOPIC Advertisers 

 14  Topic Subscribe

Sunday, December 4 - 10:19 pm - Copyright © 2000-2016 RunRyder   EMAILEnable Cookies