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The problem with the resolution is caused by the max picture size (500K) cnczone will accept. I have the original photo at 4Meg but can't load it here. PM me with your email and I will send the...

With your non-standard beam end conditions it is probably time to do some simplified FEA if you have that capability. Your 10 foot 4x8 beams weigh 275 lbs each. Making them taller definitely helps...

Last photo. Linear actuator CNC router is as done as I will get it. Cuts fine, accurate and quiet. Customer will be installing the energy chains, the limit switches, and the lathe plate on the...

If you assume for the sake of time saving that the weight of the beam is concentrated in the middle of the span and that the gantry weighs 250 lbs, then the deflection of the main span in the middle...

Goemon, 4 jaw chucks excel in holding rectangular blocks.

A way to attach a chuck to shaft. Make a chuck backing plate as a split collar. Shaft hole in split collar was slight interference. Wedged split to insert shaft. Tightened bolts to reduce spread...

Two things to maybe check. 1. Sag in the middle of your 8 foot span with gantry weight and machining loads. Might be surprising. 2. It is unclear what the fore and aft spacing is between the...

Well, remember that that belt is on the input side of the gear reduction so any sloppyness gets reduced. But I don't think belts are all that bad. My full size Excello CNC knee mill uses belts...

Another cheap harmonic drive 4th axis going together. Uses a "Harmonic Transmission" again. I like this one better than my previous integrated inline stepper one. Less work to fabricate. 200 to...

No matter how you clamp you are still going to need to drive the assembly. If you use 100 lbs of force at the bit to stall the motor as your design goal that would be 33.3 ft-lbs of torque assuming...

Goemon, sorry to be getting back to you late. The blue headstock unit is a "harmonic drive transmission" I got off ebay. It originally had an input shaft and an output shaft. The input shaft was...

You can build a harmonic drive 4th axis for not much money. This was is based on a harmonic drive transmission that came off ebay for $100. The stepper motor was $25, and the old 4 jaw another $65....

The electronics enclosure is complete. The table actuator with the cross beams has been permanently mounted. The table was installed on the crossbeams. Preliminary parameters into LinuxCNC. ...

Removed the servo from the table actuator and side mounted a stepper motor that belt drives the actuator. Mounted the table actuator and put three cross bars on it to support the extruded aluminum...

Only slow progress this week. Got the top bar installed on the frame. This ties the two gantry towers together.

Getting ready to remove the servo from the table actuator and mount a stepper to...

I like this much better. The design is getting that short squat look that a rigid design has. Looking forward to seeing the completed design.

I think your design is looking better. However bringing the two rails mounted on the gantry closer together is a move in the wrong direction. The more they are separated the better the resistance...

Baranumut, please tell me you are using two bearing carriages for each rail and not the one carriage per rail shown.

Starting to put the control box together. This will be a 38VDC system though the drives will handle 60 volts.

With your 1.3 Nm stepper your 1605 ballscrew ought to give you around 350 lbs of force at stall. Which is way more force than the structure will be able to withstand without significant deflection. ...

Use individual TB6600 drivers instead of the 4 axis board. When one blows you can replace the single driver. If you just gotta use the multiaxis TB6600 board then use low voltage. Maybe 24 volts. ...

We hope to test run this thing soon. Need to switch out the servo in the table actuator for a stepper and then we can smoke test it. Design is based off my ISEL Techno DaVinci CNC but this one is...

I use the Inkscape plugin to save G code and then run a small CNC router to engrave with. Also send gcode to my Linuxcnc converted Vanguard 3200. What is you problem?

Mounted the 2.2kw water cooled spindle on the fixed gantry router today.

Richard,
I have a ISEL Techno DaVinci CNC that is 10 in by 12 in by 3.5 in. Is is a great rigid small machine but the limited Z travel is a hassle. And a fourth axis is impossible. So I am...

Gantry and Z axis actuator converted to steppers and mounted back on the frame. View of frame on its side on the floor gives a sense of the machine size. Back view shows all the bolts and gussets...

Fixed gantry actuator (Y) converted from servo to stepper. Long length actuator in the picture. Pretty easy mod with the folded actuator design.

Lots of work on the linear axis CNC today but no photos as we took it apart again just before we quit. Got the servo swapped out of the Z axis and installed the 425 in-oz stepper motor. Photo is...

Got most of the machining of the frame complete. Bolted that together and mounted the fixed gantry axis actuator and the Z. Moving table will be next.

You can do high quality work using low quality clamps.......if you are careful. And got lots of time.