A complete failure to understand the task at hand

[Cerebus]

Really?  I am have trouble telling is the shaft of the screwdriver is insulated.  It doesn't appear to be. Bad camera work and lighting, not to mention my old eyes.

Oh, it's pretty clear if you look carefully enough:

[NiHaoMike]

However, as the motor spins down so too should the voltage across the capacitor IMO.  The windings would look like a DC short once all the fields collapse.

I think it's to cover the off chance that the motor has an open winding. Also, some switchable speed motors (particularly for fans) switch in different values of capacitors to change speed.

[SpecialK]

Really?  I am have trouble telling is the shaft of the screwdriver is insulated.  It doesn't appear to be. Bad camera work and lighting, not to mention my old eyes.

Oh, it's pretty clear if you look carefully enough:

I'm still not convinced.  Looks grey or silver to me.  Most every "insulated screwdriver" I've seen domestically has been red or yellow shanked.  The screwdiver in the video looks like this uninsulated model.


https://www.premiumtool.com/robertson-screwdrivers/

[james_s]

Also, some switchable speed motors (particularly for fans) switch in different values of capacitors to change speed.

None that I've seen. They have multiple or tapped windings, at least PSC blower motors do.

[MK14]

I'm still not convinced.

Well the person who made the video, seems to agree (that he showed it wrong), because 4 years ago, they agreed when someone brought up the subject, in the youtube comments.

Chris
Chris
4 years ago
Not trying to Troll but you should not use the insulated portion of the screwdriver, referring to 1:03 of the video, to discharge the cap. The cap wont discharge through the insulation of on the screwdriver. You were lucky to not shock yourself while removing the cap. Typically a 100 ohm resistor is used.

6

FIX IT Home Improvement Channel
FIX IT Home Improvement Channel
4 years ago
Thanks for the tip

[RJSV]

   My house here has both:
   Both a hot radiator, every room, plus that hot water feeds the house hot plumbing.

   So it's a 'BOILER' there, under the floor.