Saturday, 12 December 2015

Making a ratchet for a fishing reel

For someone else, so I have no idea where/how it fits.


Setting up the Hommel angle plate to mount the rotary table. Getting the traverses right is always a compromise.


Set up, using an M1 #3 gear cutter from CTC tools. It's not a critical thing, as this is for a ratchet.


Setting cutter height using rod of diameter same as cutter thickness, 4mm.


The supplied sample and brass blank.


The height setting "gauge in self centering 4 jaw.


The gear blank in 3 jaw.


Stting up stop for depth of cut - 2.5mm looks about right.


Setting up stop for length of cut. Once these are done, the process is pretty mindless providing you get the tables angular rotation correct.


Which I didn't, so the carefully pre-prepared end is messed up. This is a rotary table which doesn't do indexing, so you have to dial up the correct absolute angle for each cut - in this instance, it's for 24 teeth, so the angle increment is a straightforward 15 degrees between teeth, or gap. The table dials up 5 degrees per rotation of the dial, so it's reasonably straightforward. Except if you're not paying attention... having a spreadsheet of tooth number and required angle is essential, but you need to double check and not be distracted by domestic queries.


Finished. Now I can do what I want to...


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