Pop bumper design - why 2 different materials for yokes?
One yoke metal, one yoke fiber?
Why not both steel?
RussM
Pop bumper design - why 2 different materials for yokes?
One yoke metal, one yoke fiber?
Why not both steel?
RussM
the funny part is because the fiber portion has more "give" to it, many times you'll find that the fiber yoke is ok, while the metal one is broken in half.
my guess is that both materials are used to try to ensure that the part "stays together" once the metal portion is broke. since the machines are supposed to be maintained (just like your car), these are components that should be looked at every so often (probably once a month for heavily routed use, to once every 6 or 12 months for a home use machine).
Quoted from j_m_:the funny part is because the fiber portion has more "give" to it, many times you'll find that the fiber yoke is ok, while the metal one is broken in half.
I've never experienced a broken fiber yoke but have had 5-6 metal yokes that have been broken. The RFM I just shopped out had 2 broken metal yokes.
Historical precedent - on EM games the normally-closed "hold" switch for the pop bumper relay is actuated by the fiber part of the link (the switch opens when the solenoid plunger is fully retracted into the coil).
Replaced all broken parts and tested the pop bumper (BDK) switch working but coil dead.
Put the meter on it (26-1200) tested at 6 ohms; other 2 coils (and a spare uninstalled coil) at 10-11 ohms. Pulled one wire off: tested open - broken bits had wrecked the coil too.
Replaced with a spare 26-1200 and we're Green For Go.
RussM
The fiber one is a sometimes used to operate an additional leaf switch blade. So the fiber is an insulator and will not ground the switch it activates.
Quoted from KenLayton:The fiber one is a sometimes used to operate an additional leaf switch blade. So the fiber is an insulator and will not ground the switch it activates.
That makes sense.
RM
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/pop-bumper-design-why-2-materials-for-yokes and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.