Two new motors and one has a built in encoder

[robotdude]

@TCIII

Hi Jim,

Do you have a drawing of the new motor mount that you can post?

I would like to get an idea of its dimensions and the possible motor mounting positions on the mount so I can design ahead.

Regards,
TCIII

I emailed it to you.

[tciii]

Hi Jim,

Thanks! Much appreciated!

Regards,
TCIII

[robotdude]

Well the fabricator that makes the MMT-02 screwed up and made them like the old version, not the new one. I did accept them because they have been out of stock so long. Sorry, but no new MMT-02 parts for now anyway.

[dcogan]

I had a question about this encoder. Is this tied directly to the shaft, so the results I am getting are the revolutions of the shaft, or is this encoder to be connected to an external wheel?

Do we have an ETA on these returning to stock?

[robotdude]

@dcogan

I had a question about this encoder. Is this tied directly to the shaft, so the results I am getting are the revolutions of the shaft, or is this encoder to be connected to an external wheel?

Do we have an ETA on these returning to stock?

The encoder is attached to the motors shaft. We will have them back in 6 to 8 weeks.

[phill_qdn]

Hi,
Not trying to take business away from lynxmotion or anything, but I believe Robotshop.ca has stock of the GHM-15. I know I recently bought some of these from there as lynxmotion was out of stock (and for international shipping ease reasons).

link

So try them out in the mean time while lynxmotion re-stock etc.

As a note to Jim and perhaps others, on one of these motors I received the cables heading into the motor looked like they’d suffered wear/stress and the plastic coating had broken to expose the bare wires. I plan to test the motors and make sure all the cables are still intact today/tomorrow, but I’ll flag it in case this becomes a common theme from your supplier (I’ll upload or email you a picture if you care to see it or file it whatever…). Looks like they’ll still work fine but as I say, I’ll flag it in case it’s of help with quality assurances checks later etc.

Cheers
-Phill.

[italian_guy299]

@Phill_QDN

Hi,
Not trying to take business away from lynxmotion or anything, but I believe Robotshop.ca has stock of the GHM-15. I know I recently bought some of these from there as lynxmotion was out of stock (and for international shipping ease reasons).

link

So try them out in the mean time while lynxmotion re-stock etc.

     -Phill.

You wouldn’t be taking away business from lynxmotion because robotshop.ca is one of their distributers and Jim encourages us to use them when we can (like us Canadian guys).

[wade]

How does a motor with a shaft encoder work? Do you use the white and green wires to just inform something (basic Atom?) of the position of the shaft? Or record the number of revolutions of a shaft to get a tire to roll 43 feet and then stop? I’m assuming the encoder is strictly an input to a microcontroller and not a control device?

[kurte]

@wade

How does a motor with a shaft encoder work? Do you use the white and green wires to just inform something (basic Atom?) of the position of the shaft? Or record the number of revolutions of a shaft to get a tire to roll 43 feet and then stop? I’m assuming the encoder is strictly an input to a microcontroller and not a control device?

Yes it is strictly an input. You need to wire it up with power and ground as well as one or both signal wires. The two channells basically generate a square wave that are 90 degrees out of phase with each other. I believe the one that Lynmotion sells outputs 12 pulses per revolution. You can use polling or interrupts to detect when each of these channels transistions from high to low to high… The simplist code can simply count the times it either goes from high to low or the other ways and use it to determine how far you have gone. If you count both transistions, you can double your resolution. If you use both channells, you can double it again. Also if you keep track of the order of which channell goes high(or low) first you can determine direction the motor is spinning…
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[nathanmonson]

@Phill_QDN

I believe Robotshop.ca has stock of the GHM-15. I know I recently bought some of these from there as lynxmotion was out of stock (and for international shipping ease reasons).

So try them out in the mean time while lynxmotion re-stock etc.

Are there any other sources for this motor? RobotShop is now out of stock as well. They seem like really great motors from the spec sheets.

• Nathan

[robotdude]

I’m holding off ordering more of them till we get into the new larger building. Sorry for the inconvenience but there’s just nowhere to put them.

[pircapadi]

I love these

GHM-15 (with encoder)
lynxmotion.com/Product.aspx? … egoryID=11

I have 4 and would like to get 4 more, any ETA on when the move will be done and they will become available?

Adi

[robotdude]

Within the next two weeks we will be moving into the new building. BTW There will be down time! We will do our best to minimize the down time, but be aware there will be some time when we will not be able to ship.