Reed contact for disk position

[Dr.Dree]

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

 

[Tony Stewart]

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.

 

[ZipZapOuch]

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.

Ha, test engineers & quality engineers. Never let them near the customer.

 

[Tony Stewart]

Ha, test engineers & quality engineers. Never let them near the customer.

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.

 

[ZipZapOuch]

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.

Exactly.

 

[Dr.Dree]

Proof of Principle model (POP)

 

[ZipZapOuch]

View attachment 146354

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.

 

[Dr.Dree]

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.

"Perfect, good work, criticize, joking i hope" - I don't understand. Please explain what u mean...

 

[AnalogKid]

Proof of Principle model (POP)

Looks good to me.

ak

 

[ZipZapOuch]

"Perfect, good work, criticize, joking i hope" - I don't understand. Please explain what u mean...

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.

 

[Tony Stewart]

Does it start /stop with a useful load?
If it coasts past the cam bump, will it restart and keep going?
Otherwise, it works.

 

[ZipZapOuch]

Does it start /stop with a useful load?
If it coasts past the cam bump, will it restart and keep going?
Otherwise, it works.

Any reason it has to start/stop with a "useful load"? I think not. If the OP is satisfied, then the project was successful - regardless of your specification for his project.

 

[AnalogKid]

Does it start /stop with a useful load?
If it coasts past the cam bump, will it restart and keep going?

As in post #10, the width of the bump is adjusted to cover the overtravel and prevent recycling.

ak

 

[Dr.Dree]

Does it start /stop with a useful load?
If it coasts past the cam bump, will it restart and keep going?
Otherwise, it works.

In this set up there is just a few degrees "over travel" due to the 1.5V battery and 120 gear ratio. The bump covers this travel.

 

[Dr.Dree]

Is POP a teaching term? Then it should have more detailed specs in the "purpose" for start/stop in terms of time or rotational degrees. The motor current and load interia will have consequences on the "bump and switch design"

POP is short for Proof Of Principle