Bevel Gears
Bevel Gears
(OP)
Hi all,
I have been tasked with 3D modelling a bevel gear... I am slightly confused as the design includes minor details which are very difficult to measure. Can any one help me with this/ are there any standard dimensions of Bevel Gears.
I have been tasked with 3D modelling a bevel gear... I am slightly confused as the design includes minor details which are very difficult to measure. Can any one help me with this/ are there any standard dimensions of Bevel Gears.






RE: Bevel Gears
-handleman, CSWP (The new, easy test)
RE: Bevel Gears
RE: Bevel Gears
--
Hardie "Crashj" Johnson
SW 2011 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580
RE: Bevel Gears
- - -Updraft
RE: Bevel Gears
Thanks for the replies, there is some very relevant and useful information there. I need to be able to solid model them for a few reasons. Number 1 is for a CNC operation, number two, is because I'd like to know out of my own intrigue, and number 3 would be to produce an accurate drawing.
Ultimately I would like to carry out FEA. CAD I'm fairly competent in but CAM is a new world to me, currently using bob cad/cam with great difficulty! I use solid works for CAD.
Id like some pointers or tips on what or where I need to start in terms of solid modelling a bevel gear.
I've got the machinists handbook, which has excellent references on the geometric aspects of gears, so I understand the basics!
Any advise would be gracefully recieved.
RE: Bevel Gears
As far as an accurate drawing goes, you need to research how gears are specified and have been for many years. Typically the blank or non-gear features are dimensioned and the gear tooth is "detailed" in a list of specifications, i.e., DP, T, PA, AGMA Class, etc. Usually just a representation of a gear tooth is shown with no direct dimensions applied to it. The Machinery's Handbook (not Machinist's) show diagrams to indicate how these specifications physically relate to the tooth form; they are not intended to be examples of drawing dimension schemes.
- - -Updraft
RE: Bevel Gears
Opologies I meant the machinerys handbook!
I have a bevel gear which I want to model, so physically dimensioning it is something that appears to be tricky.
I do have an accurate gear to work with that has been made by a gear cutter. I wish to manufacture 20 of these gears.
Regarding computerising machining of such on object, I'm open to all suggestions, relatively speaking this is a new world to me. I have access to a slotting machine various milling macnines and one 3 axis CNC I dont however have acsses to a "hobber" I'll post some photos and rough dimensions of what I wish to model tomorrow when I'm in
Id like to think I could solidmodel a bevel gear and in turn program a machine using CAM to cut it.
Even if it meant justifying to the company I work for to buy a particular type of machine
I want to explore wether it's worth putting the effort in to model this particular bevel gear , my interest drives me more then anything!
RE: Bevel Gears
I cannot fathom buying a special piece of equipment to machine these gears instead of paying someone to make them for you. RushGear is even in that business and must have the right equipment to do a better job and faster/lower cost than you could with piece of CNC equipment.
Good luck.
- - -Updraft
RE: Bevel Gears
As for buying certain machinery, this is potentially a huge buisness area for the company I work for. People who manufacture gears for the industries I work in are a dying breed. I work mainly in the water and gas industries so The gears im trying to manafacture are quite large(weigh approximetly 20kg) they would normally be used to drive valves and will have been normally made out of cast iron so they are not precision gears in terms of tolerances.
Where are rush gear based? From what I can gather they are in the US based, I am UK based.
I really appriciate your feedback, do genuinely find it very useful, I wont be able to open your link till tomorrow as I'm currently on my iPad and I've got a really bad Internet connection,and I wont have access to my computer till tomorrow morning.
Thanks
Carlos
RE: Bevel Gears
Do not confuse cast iron gears as low tolerance gears. Cast iron is a perfect material for gears depending on their application. The precision of the gear is more a function of the manufacturing method than the material.
We use FeatureCam and realy like it. It does a great job of using our SWX part files directly.
- - -Updraft
RE: Bevel Gears
RE: Bevel Gears
To actually create a bevel gear on a milling machine will be a challenge. I would suggest a lathe turned conical form placed in a rotary index head and generating a tool path to mill the space between teeth.
--
Hardie "Crashj" Johnson
SW 2011 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580
RE: Bevel Gears
http://www.youtube.com/watch?v=lJ_S1CzMsbw
CNC machining large gears is common practice
http://www.zakgear.com/
Regards
Greg
RE: Bevel Gears
http://www.spiralbevel.com/
Regards
Greg
RE: Bevel Gears
http://www.youtube.com/watch?v=-1Gfc1Iq0GY
--
Hardie "Crashj" Johnson
SW 2011 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580
RE: Bevel Gears
Or just rapid prototype them.
Machinery's handbook and any modern CAD textbook will tell you how to create the profile and what dimensions are critical.
TOP
CSWP, BSSE
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