Reed contact for disk position

D

Dr.Dree

New Member
Hi,

What would be the most basic circuit for controlling 1 revolution of a disk at the push of a button? As per below schematic, the disk turns CW until the marker meets a sensor. Then, with a single push/release of the button, the disk makes the next revolution. Etc.
Disk speed 60 rpm. Position accuracy is not required. Circuit power ±10W. Mechanical, optical, magnetic, etc. solutions are allowed.



Thank you
 
Solution
Have you decided on the sensor, or is that part of the question?

This can be as simple as a SPST switch with NC (normally-closed) contacts. When a protrusion/extension/whatever on the wheel hits the switch, the contacts open and the motor stops. To start things, connect a SPST switch with NO (normally-open) contacts, like most simple pushbutton switches, in parallel with the sensor switch. Hold down the pushbutton long enough for the motor to move the disk off of the sensor switch.

ak
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Save me the preaching. I have been a Test Eng Mgr and Eng Mgr for two major global firms. People who ask fundamental questions may not be aware of why switches fail and how to prevent it.
 
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ZipZapOuch said:
Ha, test engineers & quality engineers. Never let them near the customer.
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You are kind of "funny".

I was also offered Quality Mgr at Seagate in Scott's Valley Cali. and 1st outsourced design firm for Lucent/Avaya in Denver for cost and quick-turn reasons.

Infamous Ken Wing at Seagate wanted me to replace his position so he could be promoted to VP. HR asked me why they should hire me from Canada when so many Disk Drive Engineers were in Cali. I said I knew all their competitors better than anyone else.
 
Last edited:
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Exactly.
 
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ZipZapOuch said:
Oh, besides looking and working perfectly, I feel the need to criticize something - I just know there is something not perfect here. I don't want to say it so, I'll let my other OCD members do it for me. (Joking - I hope)

Looks good. Good work.
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"Perfect, good work, criticize, joking i hope" - I don't understand. Please explain what u mean...
 
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Dr.Dree said:
"Perfect, good work, criticize, joking i hope" - I don't understand. Please explain what u mean...
Click to expand...
I mean that it seems to perfectly meet your needs. That you took in a variety of ideas from members here and then laid out a proposed idea of how you are going to proceed. Then you built what you proposed and it works perfectly - meaning that it works perfectly for your needs.

I was just making fun of some other members who were criticizing your plan and trying to optimize it to the nth degree. I'm really happy that you didn't listen to them and built the thing and you seem satisfied with the results.

If you find a failure mode, wear surface or eventually need higher accuracy with the position of the off-state, at least you have a great start with your working model.

Good work and have a great weekend.
 
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