- User Since
- Aug 31 2016, 12:51 PM (147 w, 3 h)
@logan i think if we do roll forward with this then we will need to include the 8mm wrench
@logan i am not fully convinced that this is an improvement. you will still end up with cross threaded bolts/screws as it still happens even with direct access to any fastener. This only introduces yet another required tool and another fastener to keep stocked.
And yes hex drivers wear out but that happens with hex cap screws regardless.
Currently you can work on any part of the frame assembly with 1 driver. A few months ago we were consolidating all the hardware, specifically for manufacturability and RMA purposes.
Also this introduces an expensive new tool to add to the tool bag.
it would actually solve the problem for proper access. You can get at the fasteners much straighter with the motor not attached. This is the exact same as what we have done for all of Taz5 and Taz6
i think we can assemble the z lower, upper, and x end with z belt and z idler attached, just leave the z motor off. This assembly can go on the shelf held together with a large rubber band or two. then the assembly goes on the frame, with no z motor attached you will have access to the mounting screws to torque them properly, then the z motors go on and the z idlers get fastened down.
i personally would rather see a change in the assembly flow to address this issue rather than a change in hardware
i cant seem to find any boxes that are that small with a latching lid.
The one i posted above is pretty cheap too. ~$1.00 ea
@karrad the box would stay attached to the cover. you would just remove the lid from the component box
My recommendation for an alternative to the printed parts would be something like this https://www.hawkusa.com/manufacturers/hammond-mfg/enclosures/plastic-enclosure-box/1551nbk?gclid=EAIaIQobChMI5I3kl_OE4wIVErbACh1FXgRNEAQYAiABEgJo8fD_BwE mounted to the inside of the flat electronics cover with a strong adhesive patch. This way the user could set the cover down on a flat surface and open the box to remove the spare components.
I would advise against a vinyl bag or similar container that does not seal, as the machine may not always be in the upright position during transportation. Also a bag is likely to get damaged after removing the spare fuses a few times. (this is the military that requested this feature, so it should be robust)
The last thing we want is for there to be loose components rattling around inside the electronics case.
sorry if my previous comment wasnt clear,
you should see if @logan has some
@david.hall the loctite needs to be the 425 cyanoacrylate based loctite as previous testing showed the other stuff deteriorates the ABS parts
@david.hall @cmerot Just FYI there will be more custom printed parts coming with kangaroopaw and its follow up. Is there no current plan to expand clusters production abilities?
We will gladly look into alternative solutions for this fuse holder. However given that TAZ6 will be out of production soon and there are multiple shared parts between quiver and redgum (soon to be more with current ECO's), it seems that 2 additional parts that take 30 minutes or less should not bumping the cluster into a state of unsustainable manufacturability
Mon, Jun 24
Just a cautionary note:
since we dont supply a tool for this in the tool bag, customers will have to find their own wrench to work on their machine if they need to get to these screws
hmm.. can you maybe get it sent with the inventory guys next time they head to rockies? i would like to look at it.
oh well it is supposed to do that to level itself. It will skip steps on one motor until it is level, and both switches get triggered
i believe this was corrected in the latest firmware
i just needed the updated USB library,
@marcio fixed my machine
so it is not actually triggering when homing, there is something interfering and preventing the machine from reaching zmax
the correct party would be R&D, who was tasked with coming up with a way to include some nano fuses
@logan it is not a manufacturability "issue" it just means printing 2 more parts per machine.
@logan you are correct that they are 5A fuses not 5V fuses
it should be
@logan the only fuses i have ever seen blow on the rambo is the little nano fuse
So i dont think it is necessary to include the larger car fuses
Also the fuses could pretty easily fall out of the vinyl sleeve during shipping or while the machine is being moved.
This was a request from the US military as they often have to replace the nano fuses. They jump out of planes with these printers and im sure subject them to rough transportation.
there will be new firmware (135) that will correct this and should be released tomorrow
The 1600 steps in the documentation is incorrect. it should be 100
the 100 steps per mm in the firmware takes into account 16th microstepping.
the formula is:
steps/mm = (steps per rev on motor) * ( microstepping) * (1/ belt pitch) * (1/ teeth on pulley)
its a 16 tooth pulley, 2mm belt pitch, 200 steps per rev motor, 16th microstepping
i like this design
the new printed parts dont have part numbers yet, but they are the following:
Thu, Jun 20
does the machine trigger z max?
Wed, Jun 19
nice! looks good!
i think using the cyanoacrylate based loctite would work well here
I have 2 of these on my desk. I ran some initial tests, but could not find an obvious reason for the under extrusion.
I verified coasting was turned off in the slice and there was no change.
I have also ran 100 mm of filament through both extruders and they were dead on at 100mm actually extruded.
I will dig into this some more but currently i am focused on T7720
Tue, Jun 18
Weve been in a similar situation, we inserted half of the double bearing holders on mini in the past.
however i dont think it would be an issue at all
@DaniAO workhorse isnt in production yet so we shouldnt need one
lengthen the little ground wire that connects to the motor by 10mm or so
we will want to make sure this sticker is also chemical resistant
@marcio i have 2 production tool heads on my desk, the x spacing measures ~44mm and ~45.5 mm
Mon, Jun 17
@mjpelletier any suggestions on this?
@DaniAO I just pushed the preliminary BOM.
Im sure i missed something, but i tried to make it easy for whoever does the OCA bom to modify the Mini 2 bom for Kangaroopaw.
@eBeardslee i have seen a lot of printers where E2 hits the right edge of the cube but doesnt miss the top.
I just looked at @samantha 's machine and it appears to barely touch the proper location. I can see how though tolerance stacking some would entirely miss the top of the cube
@marcio can we update the E2 z plunge location for auto calibration? Auto cal finds E1 first, and then plunges for E2 and it seems the x distance is too high
Fri, Jun 14
@DaniAO im not sure what the extrusion speed is set at now, but we may be able to bump it up a bit. And it may not be a noticeable amount
Thu, Jun 13
i think maybe it could be bumped up a little, but if you go too fast it will strip out and you will be back at square one!
Its hard to say how many there have been. could be just the one, could be a lot. The problem is you cannot see the broken part without taking the interconnect board and mount off.
@jperry any updates on this.
as soon as i get part numbers i can get the drawings updated and we can get a PO rolling through JMT to get these for alpha builds
@DaniAO the BOM is what needs updated to remove EL-MS0141
Wed, Jun 12
Based on the video it seems like stall detect is not working, and the motor drivers are not functioning properly.
Seems like a bad Archim board.
@MichaelM Given that this part is mostly hidden behind other stuff i would say to go ahead and use them. A lot of the betas have a similar thing going on and i dont think it is noticeable.
@MichaelM do you know why the parts are NC?
@logan this is the same setup as taz6, and as far as i know there was never any issue there. So the only change here really is the packaging. Are we using the same packaging as taz pro for W.E.?
@zachah see my previous comment. This was intentional, however it is clamping too much in some cases. There's a lot of variance across 100+ machines
@david.hall that is good! I was speaking with @ west about this and the bushing bore is undersized so that when it is tightened to the flat surface there is a clamping force applied to the bushing. I think this should be adjusted to alleviate the excess drag on the axis.
@west will you start an ECR/ECO for this?
Tue, Jun 11
@kent I believe it is Baldwin's drawing so that the interference between the tooth profile of the spur gear and the hole for the set screw in the pinion gear is minimal. this will help prevent broken spur gear teeth. Ideally there would be no interference between the hole and the spur gear teeth.
@oliver i thought they already were doing this on all bearing parts.
So I would say yes. And i think no more than 10N or so on a single bearing, since the spec is 15N for a double bearing part
i would be curious to see what they are coming in at.
Mon, Jun 10
I agree that adding dummy pins is not a very efficient way to build these for production, however we have done dummy pins in the past, and i think this is a better option than hot glue.
i think that if we switch the rear screw to stainless we should switch the top blue screws to stainless as well. This would keep all toolhead removal screws the same color
Fri, Jun 7
can you check slicing settings for this?
it seems that coasting might be enabled and that could cause something like this
I just spoke with @MikeR over here at Rockies, and he showed me the problematic part.
In this particular instance, the threads have been stripped out on the side that the screw engages, so the part is damaged beyond usability.
He was going to countersink the locating holes a bit more to see if that would help, but i dont think that will make any difference.
There are just no threads left to engage.
We discussed switching to a longer screw, however the m3x50mm is the longest screw offered in the blue dyed option.
@MikeR where are you seeing that its a 3mm hole with +/- .75mm?
Im seeing that the hole is called out as M3x0.5mm thread
sounds good! thanks!
Thu, Jun 6
if possible i would like to get ahold of one of these for further evaluation
I think using the cable scan is a must as well
sounds like the hole was drilled off center?
@MikeR can you check one of these problem plates against the drawing?
current profile settings
also under hot end settings
Note the machine changes for build plate size were set based on the small petri dish i have been testing with and these values may need to be changed later depending on the desired petri dish size
I built the machine off of the Mini2 SL, but you could use SE or whatever
Wed, Jun 5
See T7627 for update
@david.hall these are the bushings in AS-PR0141 X double bearing holder
Tue, Jun 4
Im inspecting a machine for high x backlash measurements that @franklin brought over.
I noticed that the xcarriage had a lot of rotational play about the y axis, Upon removing the lower igus bushings, I could see that these bushings were extremely over broached.
@david.hall yes you are correct, the broaching on the assembly line is only temporary due to the interference in the x double bearing holder (T6933)
once the ECO is complete there should be no need to broach on the line anymore
@david.hall this is about broaching the igus bushings
Mon, Jun 3
@logan yea i kind of doubt the part would crack at 5 in*lbs as well.
Upon further discussion we would like to modify the back plate such that there is an added fillet on the bottom that will match the fillet on the bottom plate.
I will get an ECO going for this change
per discussion in R&D chat i suggested we could modify the bottom plate such that the mounting hole for the blower shroud doesnt go all the way through. This would be a fairly easy change and would ensure that they get installed correctly