I was going to measure it tomorrow, but I see you probably have all the info you need nowOh man, that powder is sad to see.
Your large gear seems to be in better condition than mine. I don't suppose you'd mind taking an external diameter measurement, would you? I'm not sure I have a single diametrically opposed pair of unworn teeth on mine.
I contemplated getting my mate to print a gear with a 3D printer out of PLA.
I wonder how well it will hold up/if it all.
Thanks.
I was just thinking PLA because that is what most 'home' 3D printers can print easily.
I contemplated getting my mate to print a gear with a 3D printer out of PLA.
I wonder how well it will hold up/if it all.
Clive ("Workshopfriend" on Youtube) did the measurements/calculations and found it to be 20 degrees. And yes, it'll be Imperial, as all of the bolts are too.Is it 14 1/2 or 20 degree pressure angle? Likely imperial, not metric at that age? Diameter is easily calculated from DP (or MOD, if metric) and number of teeth.
Gear cutters are readily available, but easy, I suppose, once dialled in on a CNC machine. I would be making one a bit more slowly on my mill.
The mathematics of this is way over my head, but I can get the dimensions and tooth counts.Pressure angle 20 degrees - I thought it looked like it.
56 tooth would be 3.625“ (3 5/8”) diameter.
89 tooth would be 5.69” diameter. 89 is not a usual tooth count.
Knowing the tooth count of the other gear with the 56 tooth would allow the tooth count for the larger gear to be easily calculated (centre distance of the shafts are fixed, so only certain combinations are possible).
From my limited experience with 3D printing (I have a Mars 2 Pro resin printer), I would say that non-commercial grade 3D printers, FDM or resin, will give you disappointing results.I contemplated getting my mate to print a gear with a 3D printer out of PLA.
I wonder how well it will hold up/if it all.
Meddings still supply their gears in tufnolIf you're going to machine one make it from Delrin. I believe that is what you'll get from Meddings anyway.
The mathematics are easy.
Diameter (in inches) = tooth count +2 / DP. It's a 16DP gear so diameter = 89+2/16 = 91/16 = 5.586" or 144.46mm
Newest ones I have seen from Meddings was white Delrin (2022 purchase).Meddings still supply their gears in tufnol
Thank you for the offer. All my gears are intact, Pete. kindly made me a small gear from Delrin.From my limited experience with 3D printing (I have a Mars 2 Pro resin printer), I would say that non-commercial grade 3D printers, FDM or resin, will give you disappointing results.
Consider that these gears can be cut from less than £30 of material (12mm POM-C) with a £5 end-mill (single flute, ø2mm, 15mm flute length).
If you, or anyone else needs one, let me know as I would be interested to try this out. POM-C is apparently the easiest of plastics to machine.
Already look to have too much for anything other than slow speed - usually a max of 1.2 to 2/3 of the free space in the bearing - worry is the grease simply pushes around with the race, rather in and around. In reality it's probably just push out as the bearing rotates and find a happy running quantity, especially I seem to remember discussion of oil somewhere?Alright, it's almost back together. Thank you so much to everyone who pitched in with advice.
One more question; since there's room, should I pack any more grease into these bearings? The front one has a grease nipple and a fairly large reservoir, but the rear one (input shaft/pulley) will be inaccessible once the pulley is back on.
View attachment 347973 View attachment 347974 View attachment 347975
Ah mine was about 5 years agoNewest ones I have seen from Meddings was white Delrin (2022 purchase).