I really wonder about that 300 operations number. It isn’t listed as a MTBF.
It does seem low compared to other switches. Also, keep in mind that other
types of switches (for example, household types of rocker switches) are
intended to be operated many times. So, the statistical number of cycles
before a failure would be very important. Perhaps they just decided to put a
low number of cycles for a lifetime of the switch so people wouldn’t use them
for other applications?
Here’s another important consideration: Say you are planning on using a
Microswitch to arm electronics. Chances are, you will need to create some
mechanism to do this. But, how durable and reliable will your mounting and
operation of the switch be? Would you be able to cycle it 10,000 times? Just
saying that I’ve had the little tube that guides a pull rod on a microswitch
fail when the epoxy came loose.
So, there are many considerations, and we never run out of stuff to cause us to
lose sleep. ??
Richard Dierking
From: Gregory Lyzenga<mailto:lyzenga@xxxxxxxxx>
Sent: Thursday, January 19, 2017 12:35 PM
To: roc-chat@xxxxxxxxxxxxx<mailto:roc-chat@xxxxxxxxxxxxx>
Cc: Allen Farrington<mailto:allen.farrington@xxxxxx>; Vern
Knowles<mailto:knowles.vern@xxxxxxxxx>
Subject: [roc-chat] Re: Switch Warning - Schurter 110-220
On Jan 19, 2017, at 12:22 PM, R Dierking
<applerocketry@xxxxxxxxxxx<mailto:applerocketry@xxxxxxxxxxx>> wrote:
Now, I think Vern has identified the most likely cause of this problem. The
switches are ‘cooked’ prior to even being used.
You should be careful not to assume there is just one singular failure mode.
Soldering damage doesn’t seem like it would explain the manufacturer’s small
number of rated cycles. There may be more than one factor in play.
- Greg
----------------------------------------------------------
Gregory A. Lyzenga <lyzenga@xxxxxxx<mailto:lyzenga@xxxxxxx>>
Dept. of Physics, Harvey Mudd College (909)
621-8378<tel:%28909%29%20621-8378>
Claremont, CA 91711-5990 mobile (626)
808-5314<tel:%28626%29%20808-5314>
