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What's the pressure angle? 14.5 degrees? 20 degrees? Eyeball gauge suggests it's 20 degrees, but you better know for sure before you start cutting anything.
Given that the dimensions are metric, the only way that drawing makes sense as a standard pitch is if 18mm is the pitch diameter, not the outside diameter, and if it's 0.45 module. If it's a bastardized drawing of an inch part in metric units, it might be 64 DP rather than 0.45 module, but I'd think that even a sloppy draftsman would have not written 18.0mm in that case.
So you would select an involute gear cutter of 0.45 module and the appropriate pressure angle. Typically, those parameters give you a set of eight numbered cutters. To cut 40 teeth, you want the #6 [edit: original was #3] cutter, which is appropriate for cutting 35-54 teeth.
[Added in edit] Actually, I am making a major assumption that this is an involute tooth form, which is almost universal. If these gears are for clock mechanisms, they might well be cycloidal tooth form. Better know that before cutting anything...
Well, either OD = 18mm is a mistake (for pitch diameter = 18mm) or this gear calls for a non-standard, custom gear cutter.OD is 18mm and the PA is 20 degress and is an involute tooth form.
Well, either OD = 18mm is a mistake (for pitch diameter = 18mm) or this gear calls for a non-standard, custom gear cutter.
It is good that you know the pressure angle and tooth form!
Is this for a turntable?
That's the module of the gear, which is a measurement roughly similar to diametral pitch in Imperial gears. (Think of it as being "how many threads per mm." in a tap.) And... the example is not the actual cutter you need, it is to show the number of the cutter for the number of teeth it can cut. I was making the point of the way module cutters are numbered, because the kind response of sfriedberg might have needed a second look on that issue.Video Man, I am new to this what does the .75 mean??
Pat
Hi all, I am going to attempt to cut some small gears but do not know which cutter to use here is what I have.
40Tooth 18mm round.
Thanks Pat
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