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Hello everyone! | Model Engineer

Hello everyone! | Model Engineer
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Involute tooth depth | Model Engineer

Posted by Howard Lewis on 07/04/2021 15:17:20:
If you use an Involute gear cutter, it is likely to be marked with the df number, which is the depth of cut.
More usually referred to as d + f .
If you search for d + f gear or whole depth of gear tooth , there is a lot of material available.
For metric gears, this one is good: https://khkgears.net/new/gear knowledge/abcs of gears-b/basic gear terminology calculation.html
For imperial gears (not your current challenge), this one is good: https://www.bostongear.com/-/media/Files/Literature/Brand/boston-gear/catalogs/p-1930-bg-sections/p-1930-bg engineering-info-spur-gears.ashx ....

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HSS Tool Geometry | Model Engineer

I just use a plain knife tool - with a cutting edge square to the spindle centreline, a plan trail angle of about 20 degrees and a point radius of about 20 thou/ half a mm. Leftmost tool in the pic.
If I m roughing, I might angle the toolpost to give a plan approach angle of 10 degrees or so, but as an amateur machinist I m not often in enough of a hurry to do that.
If I m finishing, I quite often cock the toolpost over so as to almost eliminate the plan trail angle, and use the trailing edge of the tool almost as a shaving face - small depth of cut, low speed, bit of lube, variable feed depending on results. ....

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Can I ask members for their advice on these two...???

And as recent Forum posts have shown, there are scammers out there waiting for the unwary.
An old machine will lack the features normal to more modern machines, may be worn or damaged, and could have parts missing. Finding replacements can be problematical, even IF a part can be found. It may be even more worn or damaged than the part that you want to replace. Or your machine may be a Mk1, and the part, when it arrives turns out to be for a Mk2A. and so either will not fit
(They upgraded / changed the gears, sizes or threads? May even have inverted things like dovetails) ....

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Real Bull CJ18, metal spindle drive gear (Pulley)

Having just replaced the headstock bearings and the hi - lo gears in there with metal ones, i guess this was bound to happen,
The toothed drive gear that the motor drives exploded on me when i accidentily dug in whilst parting.
Now i was thinking of changing that gear anyway for a slightly larger one, so i can get a little more torque at the low end.
I m thinking if i go for a metal one, the weak link will then be the belt or the motor drive gear, so would i be best going with a plastic gear here and having this is the fusable link ....

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