Some time ago I asked about advice on making a timing pulley. With your great help I finally found some time to put theory into action. I really was curious about the result so I gave it a go. The pulleys are made more from curiosity than necessity thou.
This is a short movie of the process excluding turning.
I'll try to install pulleys into machine and see how they are performing.
The Following User Says Thank You to wiatroda For This Useful Post:
Why did you remove metal from the OD but finish off turning it in the lathe ?
Why not either turn it all off or mill it all off ?
Other than that nice job.John S -
I like this idea a lot, is there a method to calculate the hole sizes and position around the edge?If the nagging gets really bad......Get a bigger shed:naughty:
number of holes multiply by the pulley pitch
25 x 3mm = 75mm circumference of pitch circle
so the radius will be 75/2 x 3.14 - it's not the pulley diameter which going to be smaller
The hole between teeth diameter is 1.8mm in case of 3m HTD pulley
From the radius length previously calculated subtract 0.691 mm (as per pics above)
11.9366 -0.691 = 11.2456mm radius of circle where you drill holes
In any CAD program draw polygon which number of sides correspond to the teeth number inscribed in circle of diameter previously calculated (11.2456mm - in my case)
Place circles of 1.8 dia in a peaks of polygon
and now the resulting ring of small circles is a pattern for cnc to drill
Hope I described it logically
I'll try to upload some drawing later
That's an actual drawing of my pulley
red circle is the pulley pitch
green - pulley diameter which i turned down after milling + filing to chamfer an edge
white polygon inscribed in circle of 11.2456mm
That's the way I did it, but if you have Gearotic it will draw you nice pulley shape- that's easier way, but for my curiosity and making my life more complicated I troubled myself with all the calculations :rofl:.
Hope it helps
A lovely bit of lateral thinking!
TomSherline lathe, Chester DB11V lathe, Myford/ Rodney mill, CNC mill Isel/ home made, Sealy Hack Saw, Meddings Pillar drill.
Part two of my timing pulley adventure.
This time I used fly-cutter and rotary table.
Personally I would recommend this method than tooth drilling- less hassle - better tooth shape/finish. Making motorized rotary table would make whole job much easier.
Looks like next project will be rotary table conversion:whistling:.
Impressive that your router is rigid enough for that. I did mine on the milling machine using the same process and it clearly put a lot of force on the spindle.
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