Search found 1825 matches
- Fri Sep 03, 2021 8:32 pm
- Forum: General Discussion
- Topic: DC variable speed motors
- Replies: 15
- Views: 6953
Re: DC variable speed motors
Probably not the manufacturer's nameplate.
- Thu Sep 02, 2021 9:15 am
- Forum: General Discussion
- Topic: DC variable speed motors
- Replies: 15
- Views: 6953
Re: DC variable speed motors
May be a series wound "universal" motor.BigDumbDinosaur wrote: ↑Wed Sep 01, 2021 11:56 pm This motor is an intermittent-duty unit.
Also, if you carefully read the nameplate in the one photo it says "60 Cycles". I must say I've not run into too many DC motors that run on 60 cycles. :D
- Thu Sep 02, 2021 7:26 am
- Forum: Casting & Foundry Work
- Topic: Oil fired crucible furnace
- Replies: 15
- Views: 17475
Re: Oil fired crucible furnace
>One thing you should know is that the nozzle will be at the end of the necked down tube, so there shouldn't be any combustion behind the nozzle. I'm assuming, perhaps incorrectly, that the mixture of air and atomized oil enters the fat end of the tapered tube. If so you have a blowback hazard becau...
- Wed Sep 01, 2021 6:03 pm
- Forum: General Discussion
- Topic: DC variable speed motors
- Replies: 15
- Views: 6953
Re: DC variable speed motors
Treadmill motor. Good for 3/4 hp for perhaps five minutes out of each hour. Ok motors when you can get them cheap or free but you have to derate them. The controller looks like junk. The package is over priced.
- Wed Sep 01, 2021 4:07 pm
- Forum: Casting & Foundry Work
- Topic: Oil fired crucible furnace
- Replies: 15
- Views: 17475
Re: Oil fired crucible furnace
Other things being equal dropping the nozzle diameter from 4" to 1.5" will give you 7 times the nozzle velocity. The flame wants to burn at the point where the flow velocity equals the flame front velocity (a constant, more or less). If you don't reduce flow the flame may lift or blow out....
- Tue Aug 31, 2021 6:05 pm
- Forum: Riding Scale Railroading
- Topic: clearance height for batteries
- Replies: 8
- Views: 6450
Re: clearance height for batteries
With lithiums don't rely on "should be sufficient". Do the calculation.
- Tue Aug 31, 2021 6:02 pm
- Forum: General Discussion
- Topic: Help reading print please
- Replies: 8
- Views: 4583
Re: Help reading print please
They are telling you that the hatched area shows a cross-section.
- Tue Aug 31, 2021 11:57 am
- Forum: Live Steam
- Topic: ORC, Freon instead of Water
- Replies: 11
- Views: 5234
Re: ORC, Freon instead of Water
>The fire side resistance R1 may be 100 to 500 times the resistance of the metal wall R2, and the fluid side resistance R3 may be 10 to 50 times the resistance of the boiler wall. Engineeringtoolbox has tables, equations, and calculators to help compute the heat transfer from the hot gas to the tube...
- Mon Aug 30, 2021 12:21 pm
- Forum: Riding Scale Railroading
- Topic: clearance height for batteries
- Replies: 8
- Views: 6450
Re: clearance height for batteries
>Should have asked, Would this matter if I latter converted to lithium? (Possible future plan.)
Yes. With lithium cooling is a major consideration.
Yes. With lithium cooling is a major consideration.
- Mon Aug 30, 2021 10:04 am
- Forum: Live Steam
- Topic: ORC, Freon instead of Water
- Replies: 11
- Views: 5234
Re: ORC, Freon instead of Water
Googling
thermodynamic properties of R365mfc
gets los of hits.
thermodynamic properties of R365mfc
gets los of hits.
- Mon Aug 30, 2021 8:00 am
- Forum: Riding Scale Railroading
- Topic: clearance height for batteries
- Replies: 8
- Views: 6450
Re: clearance height for batteries
Two inches will be adequate. With only four batteries just make sure that there *is* ventilation and you'll be ok. Hydrogen only comes off during charging. I did the electronics for a medical standby power unit that had four turck batteries in a stainless steel box. The project engineer was concerne...
- Wed Aug 25, 2021 3:06 pm
- Forum: Riding Scale Railroading
- Topic: Remote Control thoughts
- Replies: 43
- Views: 32855
Re: Remote Control thoughts
2.4 GHz is an ISM band available for WiFi on a non-interfering basis. Not a good idea to use it for anything that really matters.