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Unread 02-11-2018, 05:39 PM
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Re: CNC Routers for FRC Robotics

Okay so I know I'm way late to this thread but maybe someone can get me oriented a bit. We're a team with precious little build space, so we're looking for a good CNC that can fit and work in a limited area. Something like the Sherline 5400 maybe? But I've heard you can do better for it's size and cost. Any input or suggestions would be greatly appreciated.
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Unread 02-11-2018, 06:21 PM
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Re: CNC Routers for FRC Robotics

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Originally Posted by trycatch View Post
Okay so I know I'm way late to this thread but maybe someone can get me oriented a bit. We're a team with precious little build space, so we're looking for a good CNC that can fit and work in a limited area. Something like the Sherline 5400 maybe? But I've heard you can do better for it's size and cost. Any input or suggestions would be greatly appreciated.
I used to manage a lab with 3 or 4 Sherlines, lathes and mills. They're cute, of limited usefulness for teaching, but not really useful for FRC purposes. I wouldn't bother getting one for an FRC team.
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Unread 02-11-2018, 07:20 PM
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Re: CNC Routers for FRC Robotics

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Originally Posted by JamesCH95 View Post
I used to manage a lab with 3 or 4 Sherlines, lathes and mills. They're cute, of limited usefulness for teaching, but not really useful for FRC purposes. I wouldn't bother getting one for an FRC team.
Any suggestions on something better in a similar size / configuration? Like I said, our build space is painfully limited, and being able to do small parts ourselves would be amazing. Right now my biggest stress each build season is finding a ton of build help.
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Unread 02-11-2018, 07:49 PM
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Re: CNC Routers for FRC Robotics

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Originally Posted by trycatch View Post
Any suggestions on something better in a similar size / configuration? Like I said, our build space is painfully limited, and being able to do small parts ourselves would be amazing. Right now my biggest stress each build season is finding a ton of build help.
I'd suggest starting a new thread with more details to solicit advice.
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Unread 02-13-2018, 09:59 PM
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Re: CNC Routers for FRC Robotics

Anyone have any pictures/guides with regards to setting up a water cooled spindle? I've been window shopping a while, and would like to know what's involved with setting up various options.
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Unread 02-14-2018, 01:47 AM
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Re: CNC Routers for FRC Robotics

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Originally Posted by Lil' Lavery View Post
Anyone have any pictures/guides with regards to setting up a water cooled spindle? I've been window shopping a while, and would like to know what's involved with setting up various options.
Connect hoses to spindle, connect other end to fountain pump, throw pump into bucket of distilled water, add 25-50% RV anti-freeze to discourage mold growth.
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Unread 02-14-2018, 02:08 AM
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Re: CNC Routers for FRC Robotics

Anyone have any favorite tools, feeds, speeds, and depths of cut for polycarbonate? I'm not real happy with slotting with the straight flute bits from McMaster. Too much chatter when slotting.
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Unread 02-14-2018, 02:21 AM
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Re: CNC Routers for FRC Robotics

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Originally Posted by sanddrag View Post
Anyone have any favorite tools, feeds, speeds, and depths of cut for polycarbonate? I'm not real happy with slotting with the straight flute bits from McMaster. Too much chatter when slotting.
Get a pressure foot if you can. I usually go full DOC at 100 IPM/24K RPM with a sharp single flute. It's best if you keep your metal and plastic endmills separate.

Without a pressure foot sometimes placing weights around what I'm cutting helps to stabilize the work.
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