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Hi,

you are using AC servos with only the resolver? that is a quite coarse way to determine the motor's position, especially at low speeds. The resolver alone is good enough for speed control...

Hey Treischl,
i'm sure you're busy cutting things with the machine, but hoping you can find the time to post some pics of your completed project.
Thanks!

Good Progress!
T-Slot table looks nice, i was planning for something similar. Need to find out what clearance i can achieve first (will hit the scrapyard tomorrow to find material). I'll also drill...

Treischl,

i revived my old thread and put a drawing of my planned belt tensioner in there.

http://www.cnczone.com/forums/showpost.php?p=266891&postcount=13

i have changed alot of things...

i have changed a lot of things in my router design, more details will follow. For now i'm showing the belt tensioning system that i'm planning to use. It consists of an eyebolt and diy flange...

Thanks for the pictures and i am glad that the rails work for you as planned. I have seen one other builder use such rails but no explicit feedback on the performance. You inspired me to continue...

I was thinking about glueing the angle iron down in the v-groove. Screwing would work, too, as the double-v wheel leaves some room in the center. You'd have to drill the angle right in the center,...

Looks like a nice project and good progress so far. I am wondering what kind of tolerances you can achieve on the rails. Linrol specs +-0.05mm from edge to edge of double-v track.
If you can get it...

Andy, there are low speed and high speed die grinders.

Nikki, i am also very interested in running a 1617 EVS on 50 Hz....
i compared the replacement parts lists (bosch server) and the motor...

Managed to install ubuntu linux and EMC2 today. Didn't work quite as described on the linuxcnc page though, i had to manually add a package repository and install with the package manager, the script...

Shopbot has a good reputation, useful machine and good customer service. You might want to call them, and/or check their forum. It comes with software you need for the operations you listed.
FWIW i...

I already have the servos.. gearing is easier said than done, with belt reducers you're looking at a dual stage 60:20 transmission. I am not a home machinist, making a good reducer, even single...

Barry, is the machine you are showing a gantry or cantilevered design?
Lots of commercial machines are cantilevered to make table access easier.. they usually have one rail at the table corner and...

How do you like this version?
(low table/high rails, like Shopbot)
I like it, although it comes with the downside of worse table access and a little less Y travel. The gantry is also wider than in...

Thanks Karl, indeed US Digital has 10mm shaft sizes! somehow i overlooked this before...

Gerry, i value your opinion. The gantry beam is surely stiff enough, it will not bend much at my cutting...

Zoners,
welcome to my build log :D
I will build a woodworking router, work envelope about 2100x800x100mm which will be driven by servos directly on toothed belts. The gantry will be driven from...

Jason,
movement per rotation is effective diameter * pi. I suspect it is more than 28mm with an 18t pulley. Actually i think you forgot to multiply by pi.
550ipm doesn't sound *that* fast.. how...

It would.. center drive necessitates a quite stiff gantry to avoid racking under load, but it is the same problem with single screw drives.

Alot of commercial belt drives list their accuracy as 0.1mm (not including accuracy of the motor). Therefore i am not sure if you gain much by having motor resolution much better than that. I am...

Hi,
there are a number of belt drive users here, ynneb for example. Axxus also built a machine with belt drive (see ynneb's gallery). Also look at Tim Koene's video of his commercial belt driven...

search "indexer"

Bosch will release a fixed base router in the europen market soon. It is the 230V version of 1617EVS, called GMF1400CE Professional and will cost 400€ (complete set with both bases).
I am wondering...

thanks for the descriptions and picture of your machine. lucky you! nice machine for the price! it looks big for the cutting area.
what kind of rapid speeds do you get?
Is the long axis only...

Servos don't have a resonance and run generally smoother, quieter and more efficiently than steppers. way to go if you want "ice skate" like performance.
An old thermwood sounds like a *really*...

How do you measure timing belt tension?
Do you have twist in the belt maybe?
At which point does the belt snap? Near the clamp?
What bending radius do you have in your setup?

I'm preparing...

There is a DIY cable chain made from wood and a plastic strip on solsylva:
http://www.solsylva.com/cnc/5cnc54.html
doesn't look too bad..

I don't know of a video, but here's another article about it (in german):
http://www.fh-ulm.de/Fachbereiche/Maschinenbau/aufgelesen/oekologisch/epple.html

This is not a DIY machine, just showing that good/commercial machines can be made from wood..
German company Epple, a traditional maker of woodworking benches, also offers a cnc router made...

Ynneb,

a spring loaded hold down bearing will also auto-compensate for wear on the angle iron. I will definitely do this on my machine.
Thank you very much for showing your machine, it has...

I am wondering about mounting an encoder and a brake, too. there are encoders which go on the drive shaft..
I guess i will worry about that after finding a suitable servo with a brake.