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View Full Version : Not really a log... LaserCut router



Guldberg
06-22-2007, 06:02 PM
Here we go again... I have noticed while making my CNC lathe and my first router that i suck at updating my post. This post is going to serve as a semi log where i can ask for design input ad hoc.

Down to buisness, this is my second, and hopefully way better, router than my modified solsylva build. Here's the design

http://www.jacobguldberg.dk/Pics/LCR1.jpg

http://www.jacobguldberg.dk/Pics/LCR2.jpg

The base of the router (blue parts) are made of lasercut 10mm steel. The white parts are going to be aluminium and the whole slider system is real linear slides (no more homemade solutions). Total cost will proberly end at around 1200-1400$ assuming i can get the aluminium and the powdercoating for free. Roughtly half is salvage parts from the old router.

I would like some design inputs for the gantry if any. The base is already cut and TIG welded together, if i hadnt broken my cam(chair) i would have taken some pictures

dz1
06-23-2007, 12:05 AM
depending on the span and diameter of the unsupported rails you might run into deflection problems, i used 20mm hardened rods for my x and y and ran into problems with 4' spans (i was pushing it i know but i figured they sold them in that size and length so someone was using them for something right ;) I would guess 20mm rods are relativly safe up to maybe a 2' span given a laminate trimmer as cutter

farther down the cross slide can go away from the rods on the x the more leverage the cutting head will have to torque the rods

Guldberg
06-23-2007, 05:14 AM
Way to go, i forgot some measurments. The x-rails are are Ø25mm, y Ø20mm and z Ø16mm. The cutting area is roughly the size of an A3 paper, which means the span is that + 10cm (y) and + 14cm (x). Im using a kress router and including all the gantry is about 15kg. Im planning on routing a lot of aluminium, so stability is a must

dz1
06-23-2007, 08:39 AM
gotcha, those sizes sound well balanced for the size of the machine.

couple questions that usually come up

how are you going to secure the x rods in the gantry sides?

might need to add some blocks to teh outside of the frame so you have a place to secure them with a set screw

I like the offset stepper mounts, little more expensive than direct drive lead screws but nice if you are you going to gear up the steppers to teh leadscrew to get higher traversal speeds while keeping the steppers in their high torque low rpm ranges.

how are you going to mount the leadscrews to take the thrust from the cuts

if any portion of the gantry turns out to develop a resonance under a cut you can always bolt or weld on ribs in strategic spots

is the leadscrew on the Y mounted offcenter?

just a couple random thoughts cant tell from the pict

Guldberg
06-23-2007, 12:24 PM
Its a little hard to tell from the pics, but the x rods are fixed to a small bracket in each end with a set screw. The holes in the brackets are oversized just a tiny bit to allow for small adjustments. The same goes for the the x leadscrew which is squeezed in between two brackets. The y leadscrew is also squeezed in between the gantry sides. It does requires som precision turning of the leadscrews.

The y leadscrew isnt directly below the rails. Jpeg coversion in pro/e sucks apparently.

Good idea on the resonace problem, thx.

Any thought on the gantrysides being 15mm aluminium, should i go thicker?

dz1
06-23-2007, 01:50 PM
i would bet 15mm would be good for the sides especially if its extruded tempered stuff which should be tougher than the cast jigplate i think. (even the cast jigplate i sure woudl be fine for this size)

on the one i am doing now i used a 1/2" thick piece of 4" wide 6061t6 for the backbone of the gantry which was 49" long and even without any braces it is pretty sturdy.

Guldberg
07-23-2007, 03:34 AM
Hurray, i got myself a new camera. Time for some pictures

The base has been assembled and welded. The gantry sides is of cause mock-ups. It turns out i can have them waterjet cut, proberly gonna be way better than me fumbling with that crappy mill we have at the students shop


http://www.jacobguldberg.dk/Pics/IMG_0007.JPG

Close up of the stepper end. To reduce size the motor will go inside contrary to the original design.
http://www.jacobguldberg.dk/Pics/IMG_0008.JPG

The Y bearings, 20mm
http://www.jacobguldberg.dk/Pics/Imgs/IMG_0009.JPG

2 of the 4 X bearings, 25mm. I love the feel of these bearing, waaaay better than the rollerskate bearing solution i used on my solsylva
http://www.jacobguldberg.dk/Pics/IMG_0010.JPG

The Z assembly milled out of 15mm alu.
http://www.jacobguldberg.dk/Pics/IMG_0011.JPG

Again using linear bearings, 16mm.
http://www.jacobguldberg.dk/Pics/IMG_0012.JPG

Feel free to comment, i still have time for some changes:-)

Guldberg
07-23-2007, 05:20 PM
Woow, 2 updates in a day.

Of cause a proper build router like this needs some decent electronic. For now i have to reuse my hobbycnc board, but in time more powerful motors properly calls for geckos. Anyway, a nice cabinet is needed. 4U 19" cabinet modified for the purpose. Everything is mounted on acrylic sheets, mainly for keeping me not electrocuting myself

http://www.jacobguldberg.dk/Pics/IMG_0019.JPG

http://www.jacobguldberg.dk/Pics/IMG_0020.JPG

http://www.jacobguldberg.dk/Pics/IMG_0017.JPG

The thing on top of the transformer and capacitor is a relay board featuring 8 relays for controlling things like router, light, dust extraction and air
http://www.jacobguldberg.dk/Pics/IMG_0018.JPG

And i bet i have the smallest workshop featuring both a cnc lathe and mill:-)

http://www.jacobguldberg.dk/Pics/IMG_0021.JPG

High Seas
07-23-2007, 05:38 PM
AWESOME! Hey, with all that space (in the box)you could build the pc into the box - add watercooling, etc. Have a single purpose electronics cabinet.

Did you bend the acrylic yourself -- or hire it. Like the idea of mounting that way - nice clean look.
:cheers: Jim

Guldberg
07-23-2007, 05:55 PM
Actually its the case from my server based on a mini-itx so it could fit. But right now im using a laptop, so no need for now. Still a few things to come, a usb board with 8 outputs, 5 digital in and 2 analog (any ideas on what to use them for?:-) and a USB-to-keyboard interface to translate contack triggers into keystrokes

Water and electronic dont go hand in hand in my world:-) I dont count on adding watercooling to the router for now, spirit or cutting oil for cutting aluminium will do, else i have the cooling system for my lathe just next to.

http://www.jacobguldberg.dk/Pics/IMG_0014.JPG

Yes i bended the acrylic with a 30$ heatgun i just bought, nice tool.

Guldberg
07-24-2007, 04:57 PM
Things are coming along quite nice, i just found out today that the mill im using is totally f**ked. The X and Y is not parallel and there is a huge play in the X plan. This explains why some of the things i made came out quite bad, i thought it was just my skills:-D

Anyway here are the 90% finished Z axis

All the parts
http://www.jacobguldberg.dk/Pics/IMG_0025.JPG

The Y bearings with the bolts nicely countersunk:-)
http://www.jacobguldberg.dk/Pics/IMG_0026.JPG

The assembled unit
http://www.jacobguldberg.dk/Pics/IMG_0027.JPG

For now standard skateboard bearings will have to do
http://www.jacobguldberg.dk/Pics/IMG_0028.JPG

Guldberg
07-25-2007, 01:58 PM
Its starting to look like something...
http://www.jacobguldberg.dk/Pics/IMG_0033.JPG

I reused the spindles from my old machine,TZ14x4 (or maybe its 3, cant remember:-) Turned it down to size and threaded it
http://www.jacobguldberg.dk/Pics/IMG_0030.JPG

http://www.jacobguldberg.dk/Pics/IMG_0031.JPG

http://www.jacobguldberg.dk/Pics/IMG_0032.JPG

E-chain is mounted and the one of the x leadnut. I also reused this setup since i plan to invest in a ballscrew in a not to distance future
http://www.jacobguldberg.dk/Pics/IMG_0034.JPG

boguski.1
07-31-2007, 01:15 PM
Great build!!!!

I especially like your z-axis design. What type of bearings are you using for your leadscrews, and how are you ensuring that there is no slop between them? I am currently building as well and would appreciate any input you might have. Again awesome work, looks like you're almost done!

Brian

Guldberg
07-31-2007, 02:28 PM
For the moment, regular skateboard bearings. I just bought a car so money is a large factor here. I know its not good, but the bearing brackets can easily been turned up to size to fit the angular contact bearings ill buy in a not to distance future along side ballscrews:-)
Luckely the sides and gantry back will come free, waterjet cut and everything.

Guldberg
08-01-2007, 12:02 PM
Found out that pictures of chips flying are cool:-)

http://www.jacobguldberg.dk/Pics/IMG_0142.JPG

http://www.jacobguldberg.dk/Pics/IMG_0146.JPG

Anyway, its the block in which the Z bearings are going to mounted
http://www.jacobguldberg.dk/Pics/IMG_0153.JPG

And look at the mess for creating just a single block!!
http://www.jacobguldberg.dk/Pics/IMG_0152.JPG

This is the old and crappy, but strong mill im using
http://www.jacobguldberg.dk/Pics/IMG_0154.JPG

Guldberg
08-13-2007, 03:54 PM
So so so...

First things first, Z lead screw is now installed. Its threaded in the top and tighten in between the bearings by a regular nut and some disc springs.
http://www.jacobguldberg.dk/Pics/IMG_1783.jpg

Next, the z-slider assembly. I amazed myself by makeing something precise enough to use flatheaded screws.
http://www.jacobguldberg.dk/Pics/IMG_1785.jpg

This is going to be one solid piece of machine, this part alone is heavy like..:-)
http://www.jacobguldberg.dk/Pics/IMG_1786.jpg

http://www.jacobguldberg.dk/Pics/IMG_1787.jpg

Guldberg
08-13-2007, 03:58 PM
And now some pictures of the process. Making of the holder for the z linear berings. Borrowed a 28mm reamer set, sweet thing
http://www.jacobguldberg.dk/Pics/IMG_1796.JPG

This is one serious drill, the block is 100mm wide
http://www.jacobguldberg.dk/Pics/IMG_1795.JPG

After drilling, time for some reaming, took forever at a feedrate at 12mm/min
http://www.jacobguldberg.dk/Pics/IMG_1798.JPG

And after a lot of hours of work and fear of breaking the tools....a perfect fit. The distance between the block and back is no more then 0.1-0.2mm
http://www.jacobguldberg.dk/Pics/IMG_1800.JPG

Thats it for now, feel free to comment

Guldberg
09-27-2007, 03:50 PM
Finally, my waterjet cut 20mm alumium sides arrived, cost 0$:-)

http://www.jacobguldberg.dk/Picss/IMG_1932.JPG

The z axis is more or less finished now, only need to redo the bottom part. The bearing wont fit

http://www.jacobguldberg.dk/Pics/IMG_1934.JPG

http://www.jacobguldberg.dk/Pics/IMG_1935.JPG

It almost look like a real machine and not something made with a hammer and some nails, like my solsylva build.

http://www.jacobguldberg.dk/Pics/IMG_1936.JPG

This is really one rock solid machine

http://www.jacobguldberg.dk/Pics/IMG_1933.JPG

Guldberg
06-30-2008, 12:02 PM
Not to raise this thread from the death, but i realised i never posted pictures of the finished machine.

Someway along i decided to go the all ballscrew route. Looking at it now im quite happy i did that. Combined with precision switches i can turn the router off and on, home it and hit the same spot within 0.01 mm

http://www.jacobguldberg.dk/Pics/IMG_2983.JPG

http://www.jacobguldberg.dk/Pics/IMG_2984.JPG

brettneale
07-01-2008, 08:34 PM
Awesome machine mate, I'm very impressed! I'm tossing up as to whether I lasercut, water jet cut, or get someone to machine my gantry sideplates. What was the finish like from waterjet cutting? I know for certain that the lasercut stuff isn't that pretty afterwards, but water/laser cutting is probably MUCH cheaper than getting someone to mill them up...

Guldberg
07-02-2008, 03:35 AM
Awfull. They where free for me so i dont complain, but they ran it way to fast. Somewhere there is 0.5-1mm difference between one side and another, which mean the edges and the holes are skewed. Just like if you drilled a hole at an 5 degree angle or angled your saw while sawing.

I had to make some bushings for the holes where the rails should have been and redrill them with both sides clamped to each other.

The edges doesnt really matter, but if you have them waterjet cut, skip the holes and drill them yourself

brettneale
07-02-2008, 05:23 AM
The edges doesnt really matter, but if you have them waterjet cut, skip the holes and drill them yourself

Yeah that's what I was thinking, I've had some bad experiences before with lasercut holes that were too small (sometimes up to 1mm smaller diameter). I would definitely drill/tap all the holes myself anyways just to keep costs down.

crocky
07-04-2008, 07:51 AM
Very nice machine :)