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Yup, totally agree, it's not as if you'll suffer from voltage drop as you would on a 12v system as in a car.
Stepper motors at the back also serves to protect the motors from any knocks.
The other advantage I've noticed as mine are at the rear on my WorkBee, you can install your machine with an overhang on the leading edge ............... no leaning over when changing tools.

Good build mate

He's my modified WorkBee, with the 'Upper' work surface installed. You'll spend a lot of time in front of your machine, so it makes a lot of sense to have an uncluttered area in which to work without the need to lean over stuff constantly >>




TURK

 

Ok
I'll go for back installation. Do you know some good way to cover wires inside alu profiles?

 

The arduino cnc shield is original from protoneer
For the pololu style drivers I thought to use the S109 based ones

S109 V1.1 - FYSETC WIKI

Do you think they have thermal issues?

 

I also had a cinese clone that I used on my first cnc (4 axis foam cutter) but I read that the protoneer original one had a circuitry for End-Stop and Probe signal filtering.
They say that this eliminates false triggers and makes it possible use non-shielded cable for end-stops/probes.

So 20$ are, I hope, well paid.

For drivers side, I read that someone use the DRV8825 with Nema23 but the original ones can supply up to 2.2A max.
S109 driver based on the Toshiba TB67S109 stepper motor driver should have maximum input voltage: 50V; maximum output current: 4A (at good heat dissipation condition).

For sure I'll use them with a big heatsink and a fan pointed at it.
I hope it will work, otherwise I can buy some external drivers and connect them to the cnc shield.
Let's see..

 

Thank you
yes I saw the blackbox solution, really nice all in one solution
But I prefere to have pieces that can be substituted if broken, so external drivers changeable is my preferred solution.

Today I saw a new external driver (MKS TB67S109_OC Driver 4A max) based on Toshiba TB67S109 chip with big PCB and heatsink or a
(MKS TMC2160_OC TMC2160 driver 4.33A max), based on trinamic TMC2160 chip, made by Makerbase.
The second one has 2.3A min current so it may be overkill for my motors (2A) but has spreadcycle and on my 3D printer is really silent and super smooth..

 

Hi all,

Have something puzzling me about my new Workbee Leadscrew 1515. My main use case is cutting 1/2" and 3/4" birch plywood.

I've familiarised myself somewhat with the chipload formula, but can't seem to get anywhere near the recommended values.

If I set my Makita router to its minimum 9000 rpm, and the workbee to its max 2500 mm/min, with the standard 6.35 mm 2-flute up cutter I get a chipload of 0.00437, compared to the recommended range of 0.011 - 0.013. My machine needs to run 3 times faster or rotate 3 times slower to hit that! And it's recommended to run at pass depths of half the bit width? Even at 1.5 mm passes it sounds like the machine is struggling, wouldn't fancy trying it at 3.175 mm.

So, what should I be doing here? My natural inclination has been to back off from these extrema values, so I usually end up with something like 10000 rpm and 2000 mm/min, but it really doesn't seem right. Then I see Ooznest/Ryan suggesting running the router at 18500 for MDF earlier in the thread, or even 27000 for hardwood on Youtube, which seems to go against the chipload formula entirely. Is chipload / bit wear only something that industrial CNC users should care about?

The cuts do come out looking OK, but the machine sounds strained, which has me worried. Thanks in advance for any direction.

And if I'm trying to do something that's beyond the capacity of this machine, please let me know what my options are with upgrading it.

 

What controller do you have? The default maximum speed (federate) is rather conservative - if it's the Duet controller edit your config.g file and look for the max speed settings. Increase it until you get problems like motors stalling and then drop back. You should be able to get your maximum speed (for rapid moves at least) up to 4000 mm/min without problems. Whether you can cut at that federate will depend on other factors, like your depth of cut, sharpness of bit, and how rigid your machine is.
Alex.

And yes, many speeds/feedrate tables are for industrial machines which are in a completely different league compared to the workbee.

 

Hi Alex,

Thanks for the reply. I have the Duet 2 Wifi controller. I can't check it right now but I imagine it's set to the default of 2500.

Not especially sure what a "rapid" move is, but I'm using Fusion 360 with the Ooznest post processor which is hopefully smart enough to make the things that need to be rapid, rapid. I will give 4000 mm/min a go!

I've found two other useful data points:

Someone cutting 4 mm passes in plywood at 19700 rpm

An encouraging presentation saying not to worry about chipload

PS: I have added 2 extra 2080 extrusions to the base of my Workbee, since the sides of my spoilerboard were drooping. Hopefully that's increased its rigidity some too.

 

A rapid move is a move without cutting. If you are using Fusion 360 with the "personal use" licence you might be interested in my modification of the Ooznest post processor - Autodesk removed rapid moves for hobby users - my post processor restores most of them and also allows you to use multiple work co-ordinate settings. I have two versions of it - one also allows you to use g-code to control a spindle - on/off and speed control. The link below is to the first one - let me know if you want the one that allows spindle control.

Fusion 360/Duet post processor

Alex.

 

Thanks for the offer Alex, I'm on a "startup" licence, so maybe this doesn't apply to me? I will check it out anyway, appreciate it.

 

I'm pretty much in Giarc's ballpark numbers as well. Although I consult the chip formulas, they are definitely geared towards industrial machines. But one table that we can use freely with our "desktop" machines are the settings for 1/8" bits - which is why I have a whole lot of them! I also use 1/4" bits but sometimes tweak the depth of cut to suit a demanding cut (the chip load on a 1/4" endmill is around140% more than a 1/8" bit).

 

Hi

I have upgraded my workbee 1010 to full linear rails and I am pretty happy with the results. I am looking at the electronics now since I’ll have to reposition my controller board. My workbee came with the xpro 1. What is CNC xPRO · Spark-Concepts/xPRO Wiki controller board. My question is, will the black box be a good upgrade to do? I cut wood and aluminum and I am looking into adding a laser module. I do have the original NEMA stepper motors, but I was hopping to push them a bit faster now that the machine is more rigid. What do you guys think?

 

Thanks! I’ll put it on my list.

 

Are the files for this still available? I cant get any link to work?

 

Try this link;

OpenBuilds Workbee 1010 (40" x 40")

Alex.

 

WOW! Thanks Alex much appreciated

 

There are some minor differences between the Ooznest and Openbuilds versions of the workbee - was there anything specific you were looking for?
Alex

 

No I was really interested in how exactly it went together. I have never worked with the v-slot before and wanted to see it from every angle. I would be really interested in trying to make a build like this.

 

I have a very old manual for the Ooznest version of the workbee in pdf format - I'll attach it here;

Alex.

 

Thank you Alex very kind. Will make for some good reading

Dean

 

Hi, thank you. This will be very interesting. I am a design engineer in the construction industry but would like a garage build for my workshop at home. Love the work carried out here.