Recent content by simplystupid

That is one strange pinion profile. So now I know what I'm aiming for. this image is from vax in 2011 https://endless-sphere.com/forums/viewtopic.php?f=39&t=34532

http://khkgears.net/gear-knowledge/introduction-to-gears/profile-shifted-gears/ So, my existing 16 tooth planets are already 'shifted profiles'? And possibly the ring tooth profiles as well! Therefore it is not surprising the measurements I have made do not match the 'normal' calculated or...

Condition No.1 zc = za + 2 zb (17.1) This is the condition necessary for the center distances of the gears to match. Since the equation is true only for the standard gear system, it is possible to vary the numbers of teeth by using profile shifted gear designs. To use profile shifted gears, it...

Just checked HPC Gears again, see what else is possible. They list a 15 teeth 0.7 MOD as OD 11.9mm. But the 16 teeth planets should therefore be OD 12.6mm for MOD 0.7. Which they are not. They are OD 13.2mm. HPC Gears list an 0.75 MOD 16 teeth as having an OD of 13.5mm. That may be a perfect...

Ok Thanks, Amberwolf. I found the previous post as you describe. 15 teeth for the sun. The problem now is that I did a sherlock manoeuvre , checking from the result backwards. What is OD of a MOD 0.75 15 teeth spur gear on HPCGears website. And it is too big by far. With the planets meshed...

Hi, memory loss is my excuse for having lost the answer Miles gave to this last year. Using Bosch starter planetary ring of 47 teeth, carrier planets have 16 teeth. I think Miles said 15 or 14 teeth on the sun. Computer blew up with his answer saved on it. The OD of the planets is 13.2mm. OD =...

Thanks Miles, I didn't see how the formula could apply if the planets were in two pairs on lines which did not pass through the axis (of the sun). If that's what it takes to use the box, I'll pull off the sun using a blowtorch (threadlocked) and cut another with 15 teeth. Mark

If someone has any insight on this situation and can help out, I would be very grateful. I have tried to put together a planetary gearbox using a spare parts set for a big Bosch drill, just the ring and 4 planet spur gears. I calculated the PCD and 0.75 mod needed for the sun gear on the motor...

Excellent Mr Major, that was very helpful indeed! I took one of my rewound 'wave wind' motors and added another two brushes. No change in Kv or internal resistance. Ah, now I understand. Difficult to say how the performance might have altered. The timing was a bit off and I had to rotate the...

So have I finally understood how the Lynch motor works? So the Lynch motor has 65 windings 'wave wound', with eight magnets and brushes. So eight 'poles'. There are two (parallel?) series paths between a pair of brushes, so the result is 32.5 turns in each of those paths. It doesn't matter that...

Thanks again Major, I'm going to make a smaller Lynch motor. Best way to find out is 'hands-on'. I have just the right parts around the bench and it will be more suited to an e-bike conversion - 100mm diameter/1HP output max. This is a good link I think to 'wave...

my missing punctuation - 'I recognise your diagram as a starter motor example.' Should be !!, as very unlikely. I saw this diagram recently in a round-up of motor types. I can't get a clear picture of how the winding is connecting to the commutator from the image you posted. A four pole motor...

thank you Major, the Lynch motor works just fine and it must be I am mistaken about something going on. I recognise your diagram as a starter motor example. All motors with brushes that I have ever seen have the winding as a loop!? I have done PM DC 'wave' re-windings, it is simply skipping over...

So how does this configuration achieve the translation from low number of turns into low rpm? I wonder if someone really knowledgeable on the physics of motors can explain why this configuration works in the 3000rpm range. Having dismantled motors from the age of 6 and built and rewound many...