EPM version 3 priorities

[ctech]

Hello all,

We are getting ready to do some prototyping for the next version probably coming out early next year.

So I would like to hear some feedback on what to prioritieze one

Let me know what is important for you; size, weight holding force, price?

Some options:

30x30mm footprint 15g mass and same force

40x40mm double the force

integrated CAN bus

Kind regards

Andreas

Nicadrone.com

[Martin Nation]

Good luck

Haven’t integrated mine into my quad yet.

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[Aviv Mintz]

Holding force for sure for me.

Any reason you can’t do a few version, for people with different needs?

Regards, Aviv

 

From: open...@googlegroups.com [mailto:open...@googlegroups.com] On Behalf Of ctech
Sent: Friday, 21 February 2014 3:15 AM
To: open...@googlegroups.com
Subject: EPM version 3 priorities

 

Hello all,

40x40mm double the force

integrated CAN bus

Kind regards

Andreas

Nicadrone.com

[ctech]

Regarding the special needs cases;

It is a lot of work to design something and test it out and parts that are needed that I don't have on hand especially custom made stuff from China can drive the cost out of hand quickly. But if your special needs case justifies a high cost then not a problem.

Also there is always the option of doing the changes yourself on the circuit and the drawings or the source code. Pushing out a new PCB given that I have the parts on hand takes us just a couple of hours and it's cheap. Special made parts are always a little problematic but there are places that will do custom work for single units. And if it's something that works better or is cool I'll include it the next revision.

noted, more holding force

Kind regards
Andreas
Nicadrone.com

[fdoe]

for me it's 15g 30x30mm

[Euan Ramsay]

For future suggestions, I have:

- Hex risers need to be at least 20mm, to allow clearance for standard servo connector (assuming the move to DF13 is not being done). Alternatively - Side exits for the PWM pins.

- 45x45 form factor, for increased power, and easier mounting to gimbal mounts

- more power! :-)

- A mechanism to stop yaw rotation of the target; if you spin a multirotor around in yaw, the payload moves too easily, and can even disconnect. Is there a way to increase friction between the magnet and the target without effecting power?

- More Power!

- Did I mention more power?

- Use a less brittle conduit for the PWM and UART pins; two of my units snapped off surprisingly easily, and soldering back on was tricky

- Find a way to improve surface perfection (ie improve "flatness"). The flatter the surfaces on both magnet and target are key to power and payload retention.

Love this product btw,

Euan

[ctech]

Right now this is in the list.

lower capacitor foot print

40x 40 forma factor

4x holding force, (Ramsay: is the yaw still going to be problem for you with 4 times the holding force?)

DF13 connectors instead of pin headers, I'll do more thinking about the mechanical stability of the headers

Flatness should be improved, I am going to try to machine the magnet out of one solid piece

half the weight

Integrated Can Bus

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[Kevin Berger]

What if instead of trying to increase the strength 4 fold, you instead just add something like traction tape?  (I may have the wrong axis, but it seems that it could just be that the surface is rather smooth, and allows the cargo to move, A LOT.  I haven't had a chance to finish mine, so can't verify this, but it seems like a much smarter plan, then re-working the whole thing to allow for much more power.

[ctech]

Hmm interesting idea, what is the thickness of traction tape?

[Kevin Berger]

It literally is only an idea.  But from what I have seen, about that of sandpaper.  Like 1/8" max.

[fdoe]

Hi all,

what I plan to do is the following: the payload will get a four sided pyramid frustum (about 1cm high, 45 degrees slope), that is topped with the metal plate supplied with EPM.

The EPM on the copter will be recessed within the underside with the counter shape to the pyramid frustum.

This purely mechanical shape ensures:

- payload is centered to use the full surface area of EPM

- payload cannot rotate ("aggressive yawing" problem)

- no material between metal plate and EPM, that would reduce magnetic strength

I hope you can understand my description. Looking forward to everybody's feedback.

Cheers,

FD

[Paul Oakman]

Hi Andreas,

I have sent 2 mails to Jeff re non delivery of an epm i ordered with a quoted delivery of 23rd July. I am trying to track it but the refference sent to me by Jeff does not corrolate with any delivery system i can find.

Thanks in advance

Paul

[ctech]

Hello FD,

Sounds like in interesting might be worth a try. 

[ctech]

Hello Paul,

Our package lose rate is give or take 5%, sorry for the inconvenience. 

Let me look into it and we either reship issue you a refund if we can't find the package. 

Tracking is spotty, some countries national postal service provides it some don't. Correros de Nicaragua tracking system seems to be down for some time now. 

Andreas

[Paul Oakman]

Hi Andreas,

Thanks for the prompt reply. 

It's all i am waiting for to complete this project, down facing camera fitted apm  all there flying.

If I was to pay for better shipping to help get it here, if there is one, would that help.

Also on a side note, would you like to supply me a number for dispatch in UK to help with future orders?

You have my e-mail if you think this may help......

Paul