- Crazy idea? - 3 Updates
- Capacitor again :- ( - 3 Updates
| Ralph Mowery <rmowery28146@earthlink.net>: May 07 01:24PM -0400 In article <k9a3depovpl6q2ett0nd2pjppvgj8bjtka@4ax.com>, etpm@whidbey.com says... > >What type of 12v clutch to you have? Disc, band, planetary, radial > >pin, ratchet, etc? > A disc type from a riding mower. You may want to look into something like a boost converter similar to this one: https://www.ebay.com/itm/400W-15A-DC-Step-up-Boost-Converter-Constant- Current-Power-LED-Driver-US/253926142971? hash=item3b1f2d73fb:m:mMbCize9KE9nEnuTuZOBiIw YOu input anywhere from 5 to 12 volts and get out 12 to 60 volts. You will have to look for one that will take 6 volts as I thinkthis one just starts at 8.5 volts. I have used some similar to this but only at 1 amp output. The are almost like a DC transformer. You put in say 6 volts at about 10 and you get out 12 volts at 5 amps, not counting the efficency of the device. |
| Jeff Liebermann <jeffl@cruzio.com>: May 07 10:33PM -0700 >>What type of 12v clutch to you have? Disc, band, planetary, radial >>pin, ratchet, etc? >A disc type from a riding mower. Got any maximum torque specs on this disc clutch? My guess(tm) is that delivered torque to the auger is MUCH higher than what the disc clutch can pass before it starts to slip and smoke. What's the diameter of the auger? The engine is rated at 20Hp. The PTO spins at 540 rpm. <https://www.machinerypete.com/specs/ford/9n?referring_page=ldp> <http://www.deerparkagri.com/pto-torque-calculator.html> <https://www.munciepower.com/software/formulas> That should produce 194 ft-lbs of torque. So, will your mower disc handle 194 ft-lbs (plus a safety margin)? <https://living.thebump.com/torque-lawnmower-14646.html> ... the gross torque on a walk-behind lawnmower is generally between 4.50 and 8.75 ft-lbs. ... a riding lawnmower generally has 10.5 to 26.0 gross horsepower. Methinks I'm beginning to smell clutch smoke. Looks like the clutch might be undersized by a factor of 10x or more. The auger is fairly well matched to the tractor. I blundered across this spec sheet for a walk behind post hole digger: <https://www.aurorarents.com/equipment.asp?action=category&category=45&key=PHDWBH> It wants 275 ft-lbs of torque at 140 rpm. If I slow the PTO down to 140 rpm, the delivered torque would be: 140 / 540 * 194 = 50 ft-lbs which is still 2x - 5x times what the riding mower clutch can handle. >I have the post hole digger. They all come with shear pins which are >really grade 2 bolts. This is industry standard. Lots of folks ruin >their digger gearboxes when they use grade 8 bolts instead of grade 2. Yep. The shear strength of the bolt also needs to be calculated. What size bolt are you using? >I wanted to somehow connect the generator in series with the battery >but I like your extra alternator idea. Then there is a totally >separate circuit. I like that idea. You didn't supply a number for how much current is required to lock the clutch at 12V. My guess(tm) is that it's not much. If so, then you don't need the battery and charging circuit. You could actuate the clutch solenoid solely with the battery. Does the clutch solenoid need power to activate, or remove power to activate? (Normally disengaged, or normally engaged?) My guess(tm) is probably the former for safety reasons. If the engine slows down, the solenoid might drop out, but that's acceptable because the machine is not expected to be digging holes at idle or slower. >motor the augur could be reversed out if it gets stuck. And there >would be no spinning driveshaft hanging out in the wind. I need to >look at some surplus hydraulics. I also like the hydraulics idea. It's far more complicated, but also far more useful and versatile. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| Michael Terrell <terrell.michael.a@gmail.com>: May 07 10:49PM -0700 > Thoughts? > Thanks, > Eric Have you looked into modifying the hydraulics? |
| "Dallas" <Cybnorm@spam_me_not.Hotmail.Com>: May 07 08:40PM Clifford Heath wrote: > operate for long at a time. The run cap effectively creates a third > phase, and increasing or reducing the value moves that phase forward > or back a little, but the tolerance is never tight on these anyhow. Thank you! Very informative. -- Dallas |
| "Dallas" <Cybnorm@spam_me_not.Hotmail.Com>: May 07 08:40PM Rheilly Phoull wrote: > That's what I would do considering they are polypropylene and not > electrolytic. [thumbs up] -- Dallas |
| "Dallas" <Cybnorm@spam_me_not.Hotmail.Com>: May 07 08:40PM Rheilly Phoull wrote: -- Dallas |
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