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Unread 10-03-2017, 09:44 PM
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pic: Combat Robot Wedge

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Unread 10-03-2017, 09:45 PM
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Re: pic: Combat Robot Wedge

Nice wedge! Just wondering why make it all out of heavy old steel when you could save some precious weight by making the majority out of aluminum then put a top plate of something even harder than 4140 Steel and have it weigh less and be slightly stronger at the same time?
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Unread 10-04-2017, 09:25 AM
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Re: pic: Combat Robot Wedge

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Originally Posted by Brian M View Post
Nice wedge! Just wondering why make it all out of heavy old steel when you could save some precious weight by making the majority out of aluminum then put a top plate of something even harder than 4140 Steel and have it weigh less and be slightly stronger at the same time?
Solid materials typically fare better in a combat environment.

Plus, it's pretty thin as it is.
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Unread 10-04-2017, 09:34 AM
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Re: pic: Combat Robot Wedge

OP - you better post a picture of the final robot! This looks pretty cool.

Quote:
Originally Posted by Brian M View Post
Nice wedge! Just wondering why make it all out of heavy old steel when you could save some precious weight by making the majority out of aluminum then put a top plate of something even harder than 4140 Steel and have it weigh less and be slightly stronger at the same time?
To play devil's advocate: 4140 could he heat treated to at least 55 HRc. Though I imagine the toughness and ductility of a lower hardness are desirable in this application.
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Unread 10-04-2017, 09:42 AM
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Re: pic: Combat Robot Wedge

There is a Facebook group called Combat Robotics. It's full of discussion just like this. I would definitely recommend checking it out if you haven't already!
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Unread 10-04-2017, 09:47 AM
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Re: pic: Combat Robot Wedge

Quote:
Originally Posted by Brian M View Post
Nice wedge! Just wondering why make it all out of heavy old steel when you could save some precious weight by making the majority out of aluminum then put a top plate of something even harder than 4140 Steel and have it weigh less and be slightly stronger at the same time?
Because the shop had a bunch of 4140 in the scrap closet. I'm trying to keep a low budget with this one (despite the weight of the wedge and drum, I can still get away with 1" thick aluminum for most of the frame
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Unread 10-04-2017, 09:48 AM
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Re: pic: Combat Robot Wedge

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Originally Posted by Ginger Power View Post
There is a Facebook group called Combat Robotics. It's full of discussion just like this. I would definitely recommend checking it out if you haven't already!
Will do! Do they have any good resources on drum-in-wedge designs?
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Unread 10-04-2017, 10:00 AM
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Re: pic: Combat Robot Wedge

S7 Tool Steel is really tough stuff. Rockwell up to C53 & 273 Ksi yield strength. This material is the used for jack hammer tips as well, so it can take a beating.
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Unread 10-04-2017, 10:10 AM
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Re: pic: Combat Robot Wedge

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Originally Posted by InFlight View Post
S7 Tool Steel is really tough stuff. Rockwell up to C53 & 273 Ksi yield strength. This material is the used for jack hammer tips as well, so it can take a beating.
How does 4140 compare? Or is 4140 s7? I don't know my steel alloys all that well yet.
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Unread 10-04-2017, 10:16 AM
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Re: pic: Combat Robot Wedge

Wouldn't you be better off tapering the top edge further back (to make it a lower angle)? I would think the lower the angle the easier it would be to get under an opponent.

Is this being designed for a specific combat robot competition, and if so, which?
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Unread 10-04-2017, 10:26 AM
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Re: pic: Combat Robot Wedge

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Originally Posted by cbale2000 View Post
Wouldn't you be better off tapering the top edge further back (to make it a lower angle)? I would think the lower the angle the easier it would be to get under an opponent.

Is this being designed for a specific combat robot competition, and if so, which?
I'm not all that concerned about the taper seeing how it's already capable of peeling paint/tape off the shop floor. Also considering current design trends (armored front, no side skirts, open wheels), there really arent a whole lot (if any) of robots this couldnt get under

I plan on competing at motorama and robogames.
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Unread 10-04-2017, 11:11 AM
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Re: pic: Combat Robot Wedge

This seems to be a guillotine blade. What does it weigh? How does that compare with the original?

http://setinparis.com/wp-content/upl...15/03/ppm3.jpg
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Unread 10-04-2017, 11:16 AM
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Re: pic: Combat Robot Wedge

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Originally Posted by carpedav000 View Post
How does 4140 compare? Or is 4140 s7? I don't know my steel alloys all that well yet.
There are really four classifications of steel.

Plain Carbon (such as 1018)
Alloy Steel (Such as 4140)
Stainless Steels or Chromium Steel (410, 440C)

Tool Steels which are Alloy steels with a high carbide content. These typically have Tungsten and Chromium as alloy elements with others. These are typically used for cutting tools for other metals.
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Unread 10-04-2017, 12:36 PM
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Re: pic: Combat Robot Wedge

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Originally Posted by JamesCH95 View Post
To play devil's advocate: 4140 could he heat treated to at least 55 HRc. Though I imagine the toughness and ductility of a lower hardness are desirable in this application.
At work, we target ~40 HRC on 440c components that have high loads and require some hardness. At 40 HRC components will deform quite a bit before cracking, it eliminates the insta-cracking. Not sure about 4140, but its probably in the same ballpark.
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Unread 10-04-2017, 02:01 PM
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Re: pic: Combat Robot Wedge

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Originally Posted by Richard Wallace View Post
This seems to be a guillotine blade. What does it weigh? How does that compare with the original?

http://setinparis.com/wp-content/upl...15/03/ppm3.jpg
The original what?
Wedge weighs 3lbs, drum weights 8lbs for a total of 11lbs.
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