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  #121   Spotlight this post!  
Unread 05-07-2018, 04:06 PM
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Re: What COTS parts would you like to see?

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Unread 05-15-2018, 08:37 AM
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Re: What COTS parts would you like to see?

An actual replacement for the spike that's legal.
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Unread 05-15-2018, 09:14 AM
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Re: What COTS parts would you like to see?

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Originally Posted by marshall View Post
An actual replacement for the spike that's legal.
Automation Direct was plugging their relay pretty hard in Houston, which is all of $17.25 (but bulkier than a Spike, unidirectional, and only for 12A though they have higher-rated models).

For motors, obviously you must use a legal controller--but a Spike retailed for $35, and the SPARK can be had for all of $10 more. The Victor SPX, $15 more.

What application can't use one of those?
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Unread 05-15-2018, 09:37 AM
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Re: What COTS parts would you like to see?

Having a disc brake solution set up with proper clearances and mounting that we could use with 1/2" hex and pneumatics would be great.
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Unread 05-15-2018, 04:15 PM
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Re: What COTS parts would you like to see?

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Originally Posted by marshall View Post
An actual replacement for the spike that's legal.
+1

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Originally Posted by Billfred View Post
What application can't use [SPARK or SPX]?
Any custom circuit that wouldn't do well from a duty cycle application of power.

Just because you can simulate a spike with a motor controller doesn't make it the right answer. Extending the analogy, you can fully simulate a tank drive with a swerve, so why not always use swerve, and you can dumb it down to skid-steer in software when that's all you need?
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Unread 05-15-2018, 04:35 PM
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Re: What COTS parts would you like to see?

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Originally Posted by GeeTwo View Post
Any custom circuit that wouldn't do well from a duty cycle application of power.

Just because you can simulate a spike with a motor controller doesn't make it the right answer. Extending the analogy, you can fully simulate a tank drive with a swerve, so why not always use swerve, and you can dumb it down to skid-steer in software when that's all you need?
To be clear, "one of those" means "SPARK/SPX or an Automation Direct relay".

Automation Direct sells higher-current versions of that relay is well, up to 40A and beyond. What a Spike has that the AD relays don't, best I can tell:

1) the built-in replaceable fuse
2) the ability to reverse, H-bridge style
3) the simple Relay port hookup with an un-chopped cable

To me, the H-bridge is the only real question mark--and I don't know an application in 2018 where that's important. The only application I can think of right now that reverses is a motor, and that's handled by a motor controller for Cheap Enough.
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  #127   Spotlight this post!  
Unread 05-15-2018, 07:56 PM
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Re: What COTS parts would you like to see?

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Originally Posted by Billfred View Post
To be clear, "one of those" means "SPARK/SPX or an Automation Direct relay".

Automation Direct sells higher-current versions of that relay is well, up to 40A and beyond.
I didn't think you meant the AD relay because they aren't (through 2018) FRC legal for actuators.

Quote:
Originally Posted by Billfred View Post
What a Spike has that the AD relays don't, best I can tell:

1) the built-in replaceable fuse
2) the ability to reverse, H-bridge style
3) the simple Relay port hookup with an un-chopped cable
As of 2018, it is not FRC legal to control solenoids (either straight electric solenoids or pneumatic valves) with anything but a spike or PCM. As solenoids up to 10W continuous are legal, these larger solenoids can only be legally and adequately controlled by a spike.
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Unread 05-16-2018, 05:55 AM
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Re: What COTS parts would you like to see?

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Originally Posted by marshall View Post
An actual replacement for the spike that's legal.
There are a number of relays compatible (plug and play) with the roborio. I certainly wish that FRC would decide that relays were legal as long as they meet the specifications requirements. They do it for critical pneumatics components already.

Last edited by Tom Line : 05-16-2018 at 06:00 AM.
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Unread 05-16-2018, 08:52 AM
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Re: What COTS parts would you like to see?

Versaframe battery holder.

More wall thickness options for versaframe (0.100" wall is really heavy for a lot of applications, but 0.040" is too light. The 0.062" wall 1"x1" extrusions that come in KOP are perfect for a lot of applications, but are not pre-drilled).

Specialty chain links to attach chain to structural elements. I did find links like these for #35 chain, but the company was out of stock of the #25 links for the entire build season. I called and talked to them and they said they had been getting a lot of calls from robotics teams looking for these and were very surprised by that. Maybe next year they will be better stocked. https://www.rollerchain4less.com/35-...nk_p_2176.html

Inline filters (perhaps integrated into the press in fittings) for pneumatic system to keep FOD out of the valves.
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Unread 05-16-2018, 09:30 AM
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Re: What COTS parts would you like to see?

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Originally Posted by nuclearnerd View Post
Vex and WCP came out with a nice set of products this year for driving 1.25" OD tube as rollers. Unfortunately they pretty much all need the tube to be a "live axle" (unless you drive it with polycord or flat belt). I would love to use 1.25" tube more as a stronger dead axle for mechanisms (like our arm) but we are missing one piece:

A hub that pins to 1.25" tube (or another size), which has a 1.875" bolt circle for timing pulleys, plate sprockets and wheels
Like this?
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Unread 05-16-2018, 07:03 PM
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Re: What COTS parts would you like to see?

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Originally Posted by Jon Jack View Post
Like this?
It pins to tube?
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Unread 05-16-2018, 07:09 PM
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Re: What COTS parts would you like to see?

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Originally Posted by GeeTwo View Post
It pins to tube?
When I talked to the person behind the Vex table in Houston (sorry I forget which employee it was), they said that teams would need to drill and tap the hole in the hub themselves. To me, that seems like a lot of work a for a "plug-and-play" system, and results in the hub no longer being COTS. But it is a viable solution if you should choose to go the VersaRoller route.
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Unread 05-16-2018, 07:36 PM
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Re: What COTS parts would you like to see?

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Originally Posted by AriMB View Post
When I talked to the person behind the Vex table in Houston (sorry I forget which employee it was), they said that teams would need to drill and tap the hole in the hub themselves. To me, that seems like a lot of work a for a "plug-and-play" system, and results in the hub no longer being COTS. But it is a viable solution if you should choose to go the VersaRoller route.
I would venture to say that if an entity can’t drill and tap a hub to interface with a piece of round tubing then FRC is likely not the correct program for said entity.

To speak in more constructive terms - what would be neat, is a tool, say nominally a 2” x 2” piece of SQ Aluminum of some nominal length that is bored out to 1.25” id on one end, and 1.125” id (nominal dimensions, would want some tolerancing for slip fit) on the other, with some series of drill bushings in it to drill a versa-like pattern into tubes and other round objects. If you wanted to be really fancy, make the tool from Hex stock, so holes can be drilled in both a radial pattern (indexing to the hex) and a linear pattern.

Realistically, such a tool could even be plastic so long as it has good bushings in it. I personally would prefer metal, but I would also fall into the group of people who can make such an object.
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Unread 05-16-2018, 08:14 PM
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Re: What COTS parts would you like to see?

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Originally Posted by thefro526 View Post
I would venture to say that if an entity can’t drill and tap a hub to interface with a piece of round tubing then FRC is likely not the correct program for said entity.

To speak in more constructive terms - what would be neat, is a tool, say nominally a 2” x 2” piece of SQ Aluminum of some nominal length that is bored out to 1.25” id on one end, and 1.125” id (nominal dimensions, would want some tolerancing for slip fit) on the other, with some series of drill bushings in it to drill a versa-like pattern into tubes and other round objects. If you wanted to be really fancy, make the tool from Hex stock, so holes can be drilled in both a radial pattern (indexing to the hex) and a linear pattern.

Realistically, such a tool could even be plastic so long as it has good bushings in it. I personally would prefer metal, but I would also fall into the group of people who can make such an object.
I don't like this attitude. Making things concentric without machining capability is quite hard. Indeed, before we had a lathe (got one two years ago) we made many decisions to maximize our competitiveness while minimizing things we couldn't do. We've been doing it for a decade now. I dislike the idea of scaring teams away by making them feel like they might not be good enough.
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Unread 05-16-2018, 08:33 PM
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Re: What COTS parts would you like to see?

I'd like to see something along the lines of a "550 pro", with a 5mm output shaft so that it can interface with 775pro stuff. Many people have already told me that its niche would be relatively small, but I'd still like to see one, especially if it's colored the same way as a 775pro!
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