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Unread 02-11-2018, 04:39 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, 05:21 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, 06:20 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, 06:49 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, 08:59 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, 12:47 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, 01:08 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, 01:21 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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Unread 03-13-2018, 03:32 PM
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Re: CNC Routers for FRC Robotics

This is excellent. We received a Velox 5050 shortly before this season started. It hasn't been set up yet. It is definitely something we will be doing post season.

The array of vises along the side is really interesting. What do you recommend for an assortment of bits? The kit we got doesn't have much and I'm sure we'll break off a few as we learn. We plan on cutting aluminum, plastics and wood.

Thanks in advance.
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Unread 03-13-2018, 03:44 PM
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Re: CNC Routers for FRC Robotics

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Originally Posted by mikeb3173 View Post
What do you recommend for an assortment of bits? The kit we got doesn't have much and I'm sure we'll break off a few as we learn. We plan on cutting aluminum, plastics and wood.

Thanks in advance.
548 uses "screw machine" (stub length) drill bits for all of our hole sizes up to F in the QMTC holders and a single-flute 1/4" up-cut spiral (o-flute) endmill for all of our milling. At first, we tried using the included 1/8" 2 flute endmill for screw slots, but it didn't work well, so we switched to a line of holes instead. We are also planning on switching to a small drill chuck for our drill bits to make tool changes quicker as mentioned in Devin's post here. We also have a large woodcutting 1 1/2" endmill for facing our wasteboard which we make from the 2x12s of the crate. If you haven't spent your Inventables PDV, I'd recommend picking up their set of chamfer/v-groove bits (along with wire ferrules and the crimper for them).
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Unread 03-13-2018, 03:54 PM
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Re: CNC Routers for FRC Robotics

Quote:
Originally Posted by mikeb3173 View Post
This is excellent. We received a Velox 5050 shortly before this season started. It hasn't been set up yet. It is definitely something we will be doing post season.

The array of vises along the side is really interesting. What do you recommend for an assortment of bits? The kit we got doesn't have much and I'm sure we'll break off a few as we learn. We plan on cutting aluminum, plastics and wood.

Thanks in advance.
Quote:
Originally Posted by jnicho15 View Post
548 uses "screw machine" (stub length) drill bits for all of our hole sizes up to F in the QMTC holders and a single-flute 1/4" up-cut spiral (o-flute) endmill for all of our milling. At first, we tried using the included 1/8" 2 flute endmill for screw slots, but it didn't work well, so we switched to a line of holes instead. We are also planning on switching to a small drill chuck for our drill bits to make tool changes quicker as mentioned in Devin's post here. We also have a large woodcutting 1 1/2" endmill for facing our wasteboard which we make from the 2x12s of the crate. If you haven't spent your Inventables PDV, I'd recommend picking up their set of chamfer/v-groove bits (along with wire ferrules and the crimper for them).
Please refer to post #80 for a link to the toolholders that we use for our endmills.

1678 uses mostly 4mm and 6mm single flute carbide endmills as they are super easy to grind to a sharp end again and are undersize for 3/16" and 1/4" respectively. We buy ours from WCProducts.net. We use mostly #10 drill bits, 135 degree split point. DO NOT BUY CHISEL TIP STYLE DRILL BITS FOR YOUR ROUTER, and please just don't buy them in general, you'll thank me if you ever compare the cutting forces required.
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Unread 03-16-2018, 01:13 PM
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Re: CNC Routers for FRC Robotics

what bits are you guys using? and whats the most common material you cut?
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Unread 03-16-2018, 03:06 PM
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Re: CNC Routers for FRC Robotics

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what bits are you guys using? and whats the most common material you cut?
I was having fun with some $1.50 4mm carbide endmills from China the other day. I ordered another 10 and will be doing more in-depth testing before I recommend them to others, but they were charging through 6061 at 42 IPM at 18,000 RPM with a 0.13" stepover and a 0.075" DOC on an adaptive clear. I would ramp up the IPM but I was using 115's machine, which has a vacuum instead of compressed air, and before that 299's machine, which has neither vacuum nor compressed air. Clearing chips started to become an issue the deeper I went for slotting. In any case it was quite fast and left a fairly good finish and an accurate hole.
Boring 0.196" holes at 40 IPM and a 0.04" stepdown was awesome. Bored the holes almost as fast as a drill (~2 seconds per hole for 1/4" plate).
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Unread 03-16-2018, 03:49 PM
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Re: CNC Routers for FRC Robotics

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Originally Posted by asid61 View Post
I was having fun with some $1.50 4mm carbide endmills from China the other day. I ordered another 10 and will be doing more in-depth testing before I recommend them to others, but they were charging through 6061 at 42 IPM at 18,000 RPM with a 0.13" stepover and a 0.075" DOC on an adaptive clear. I would ramp up the IPM but I was using 115's machine, which has a vacuum instead of compressed air, and before that 299's machine, which has neither vacuum nor compressed air. In any case it was quite fast and left a fairly good finish and an accurate hole.
Boring 0.196" holes at 40 IPM and a 0.04" stepdown was awesome. Bored the holes almost as fast as a drill (~2 seconds per hole for 1/4" plate).
Wow that sounds awesome. You've got to give a link to a souse for those. We have been using HSS 3/16" diameter 1/4" shank up-cut single spiral flute for aluminum from Amana Tool. part #HSS1621 we get them for about $7 I think. We cut 1/8" DOC and 0.07" stepover at 40-50 IPM and ~15000 RPM. They're nothing crazy good. But 3 or 4 of them have lasted us so far this season, and we have easily created 20 lbs of chips on our router this year.
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Unread 04-26-2018, 12:07 AM
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Re: CNC Routers for FRC Robotics

Cross linking to a discussion on the WorkBee CNC Kit from another thread. Please keep all posts about it in it's thread.

https://www.chiefdelphi.com/forums/s...hreadid=165143

A cheap 1.5mx1.5m router that would be good for light duty work,
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