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Good points, I may have to re-evaluate the benefits of micro-stepping. The Lin Engineering 4218L-08S-01 clearance motors I picked up are higher torque, but average torque to inertia ratio of 220...

I've got piles of NiCAD cordless tool packs, they could be a good source of power. Most packs use series configuration of C or D cells so they can provide 5A or more and they are significantly...

Mariss, again thanks for your wisdom. You bring up an interesting point with the pull-out speed of the motor. I was wondering if this low speed would would result in a vibrating sensation as the...

Mariss, I've got a lot of respect for you and your opinions and agree that servos are more efficient. Unfortunately, one axis is on a horizontal pivot arm and requires nearly full torque most of the...

H500 Thanks for the information. I agree completely with your statement about bad calculations, that is why I'm looking for solid data and not just throwing something together.

MadMachines, I had...

At this point nothing is set in stone for the design. The battery pack can be configured to provide any combination of voltage and current, but the goal is to keep its size and weight down. I am...

I am working on a portable CNC style camera mount using entirely DIY parts. I have been a long time reader of the zone and am familiar with stepper motors in traditional wired systems, unfortunately...

What accuracy are you looking for. 100 lb on a pair of 10ft L beams is enough to induce noticeable flex. The math for these is simple if you know what you are doing. If not there are some good...

I am not trying to keep bringing up an old topic, but I am still concerned about using epoxy alone as a datum. .003 flattness over 20 feet is not equal to .00015/foot, there will be a menuscus along...

Ticica, you are absolutely correct in terms of load capacity of a thin layer of epoxy. Linear rails are not very stiff and the majority of the load will be distributed within a few inches of each...

In regards to self leveling epoxy, I doubt .003 accuracy is enough to use as a datum on any system worth using linear rails on. It could be used for non critical areas that just need to be smooth,...

What is the duty cycle on the machine? If it is used at least a few times a week a simple rotary 24 hour timer like those used on lamps to make it look like you are away would work. Just set it to...

Your pilot hole dia depends a lot on the type of screw and the specifics of the Nylon. "Recommended" is also a vague term as it depends what you are optimizing for, pull out strength, stress...

Just another idea if you are still concerned about gage placement, you can add a section of significantly larger diameter at the start and end to reduce velocity to near zero. Just be wary of the...

OK, this is a bit long, I'm not trying to drive the thread of course, I'll appologize in advance.

Just a note on SSRs, they tend to be pricey in a stand alone form, but schematically they are...

Who is manufacturing your off the shelf product? Based on the dimensions, it almost looks as if you are using composite counter top material. I'd love to know what your material is and more...

Has anyone tried to make a hybrid HPUHU using the encoder interface located on a standalone standard UHU board? I know the circuit has been updated a bit, but the interface to the processor is the...

Unfortunately these numbers are for phase change shirnkage (ie "freezing" in the molten to solid change). The correct property to look at for this is Coeficient of Thermal Expansion (CTE). From...

CNCLite, I am assuming the strips on top and bottom are uni-directional carbon. What is the Blue in the middle? Is it renforcenent like CF 2x2 twill or is it just representing the EG?

Just a...

Morphious

Active damping systems have been deployed on industrial machinery, but are simply beyond the capabilities of even advanced DIYers. There are a variety of technical hurdles that make...

Bruno, I think your pre-fab carbon inserts would be much more reliable than co-molding wet carbon with wet EG. A CF shell is not particularly difficult, but delamination is a problem. Suspending CF...

Having done a brief stint in hydraulic tube fitting design and testing, I can say 3000 psi is a tall order for custom parts without a little know how.

First of, what are you sealing? You refrence...

Having worked a lot with Carbon Fiber making race car parts, I would have to say that meshing it effectively with a casting mold will be very difficult. For simple structures like columns, a wet...

Just a few notes on IC engines and fuel efficiency.

VWSatOZ, I have professional experience with engine design and theory and while you are 80% correct in your theory, you are missing a few key...

From a conceptual standpoint, linear scales are the way to go when it comes to determining where an axis is in its travel, but I have to think that they will lead to resonance in the system. If...

I don't want to pour water on the fire, but has anyone actually confirmed noise problems on encoder inputs or looked at the lines with a scope? I know all setups are different, but most hobby class...

Just a word of caution on using the PWM (also called "modified" sine wave) on motors and transformers. A PWM "sine wave" is simply square waves stacked on top of each other, and most UPS supplies...

Motherboard fan headers are rarely specified in terms of max current, but .2A should not be a problem, and I have routinely run .35A fans from them. If your relay of choice needs more than this,...

I would tend to agree that 2000+ posts is simply unmanagable for one post. Unfortunately if too many sub forums are created, it becomes more and more time consuming to monitor new posts and some...

John,

While I am not a certified electrician, I play one on our companies tech support phone lines from time to time. Most things That would come to mind when I heard your problem have already...