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Messages - webby2
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331
« on: January 24, 2019, 11:38:57 am »
I gave myself permission to get sidetracked over the December-January time period, that and I ordered some wrong parts.
What was fun with the sidetrack is in what was not the same as my main build, looking at things a little different so I can have a more positive feeling about what it is I am doing.
So I am going to repair my lathe and get back to building, I have a lot of tedious parts to make and have not been looking forward to it.
332
« on: November 30, 2018, 11:23:22 pm »
I ordered some parts, for the system and for my lathe. I broke the belt for my lathe and I need it to cut the cir-clip grooves in the pivot shafts.
I had to modify my printer a little bit so I could print a part 4mm bigger than what my printer would do,, the bed was to small. I got that done and am trying to clean up the large part and get it within a reasonable tolerance.
It is taking longer to get parts from overseas, whereas they used to be a stocking item they seem to be more of an on demand thing,, more time waiting.
I have most of the other parts printed and cleaned up, one small print flaw to fix, a small warp in one of the parts, if I can not fix it nicely I will just re-print it again.
I also made a final decision on my ancillary parts, that is how they are going to be setup and what I decided will take a lot of fiddling around,, lots of small parts that need to be arrange within a bigger part and then a few bigger parts assembled into the final part, I need to make 2 of those.
333
« on: November 30, 2018, 11:46:07 am »
I found that if I have a hole for a shaft that is not right,, it might be a little out of alignment or a little small or what not,, if I place the shaft through the hole and then spin it with my drill press,, or whatever will do the job,, I can use the friction to slightly heat up the PLA and allow it to form into a better position\shape. This seems to work for small errors.
I also use a razor blade and "back scrape" the PLA to clean up the part, by back scrape I mean having an angle on the blade and sliding the face of the blade across the area to be cleaned up. I find that this also seems to create a sort of surface friction melt thing. I use the edge of the blade, whether that is the sharp edge or the square edge, not all edges work.
334
« on: November 28, 2018, 08:48:13 am »
I have made some mods to my printer,, nothing big there.
What I just noticed is interesting to those whom use PLA.
What I have been using as a glue is DAP Rapid Fuse all purpose adhesive. It works fairly well for general gluing of parts but I just used some isopropyl alcohol to clean up the excess glue around a bearing,, I was not so happy with the fit of the bearing as far as alignment goes,, I tried to tweak it a little bit and nothing really moved but about 1 minute after I cleaned up the excess I tried again but this time the plastic and glue all acted kind of like a liquid and allowed me to reposition the bearing alignment so that it is much better.
335
« on: November 14, 2018, 03:55:06 pm »
I need to stop with the time estimates,,
So I found a flaw with the build design, that is it allows for movement in the wrong plane. If the levers were moving in the horizontal plane what I get after a lot of run time is an oscillation in the vertical plane,, this comes from the stupid fact that I used a single single row bearing for the pivot of the arms,, I have changed this and am re-printing the whole thing due to the increase in sizes of all the parts.
336
« on: November 09, 2018, 02:20:58 pm »
Still playing with the main system,, I broke a few parts a few times and so thought that it would be prudent to make sure the system can run for a few hours at a time before moving forward.
So far things are going fairly close to what the sim was predicting, and if the main system follows those predictions then I see no reason that the full system should not also follow what the sims are showing.
I change how I was using some bearings, well I have them secured by bolts and some of those bearings pass over each other,, with the first designed usage I had all sorts of head room and did not think about the clearance,, but it turns out that when you lock the bearings down and close those clearances the bolt heads can collide,, and that breaks things after a while of hitting,,, my bad on missing that.
337
« on: November 06, 2018, 10:29:19 pm »
I found out a few interesting things today,,
A razor blade knife\ utility knife,, blade, has a center tang that is 3mm wide,, a very handy thing if you are making grooves to fit a 3mm wide bearing!
Too much exposure to the vapors from Super Glue will make you feel like crap,, flu like symptoms,, not happy about that.
I got carried away and rebuilt, a few times even,, an internal part of the main system, it is now smaller and lighter and is all held together by bearings running in grooves, I am still using 7 bearings for the whole system but now they are running in grooves,, once all cleaned up and washered it will be very nice. I made a small change to it to reduce some sliding friction and the tests showed a good change so I thought that if I removed all such things I would only be left with the gear mesh as a large frictional loss.
I have to grind down washers so that they become bearing spacers,, not the best way but it works.
338
« on: November 02, 2018, 09:00:47 am »
Doing some preliminary testing of the main input control system.
It is not as efficient as I would like but it is within what I was expecting,, I can always hope for ideal but I except what things are,,
I am still waiting on a few parts to show, I ordered some slippery tape to use between a few parts that slide on each other, I thought that using the tape would be cleaner than using lubricant and easier to change things out if needed. I am also waiting on a flange that will solidly lock the main shaft to the main input control system.
I will start up on the ancillary parts next week and when those are done I will be able to test the whole system.
So far all the testing I have done is what is expected and they are in line with what my simulations predicted.
339
« on: October 27, 2018, 08:43:11 am »
Things are what they are,,,
I needed to adjust a few parts beyond either my ability to do so nicely or the part itself so that has made me print replacements, no big deal it just takes time.
I had another computer failure, strange stuff in that my HD failed again but at the same time my Sons HD failed as well. I have now backed up the important files so if I have another failure I do not need to spend as much time to recover.
My printer went way out of calibration, mainly due to my own error in not securing the Y frame rails to the board the printer sits on,, got all that fixed up and my parts are printing way better. I am using a new filament, I was using Hatchbox filament but I ordered some from Amazon Basics, well this filament is a little different, it is not as flexible and not as shinny,,, it also seems to be stiffer which I think makes it more brittle but with the way I am using it the extra stiffness is a good thing.
I am almost completely done with the main system, barring any other things I missed by the end of next week I should be done with that and ready to start on the next steps.
340
« on: October 10, 2018, 06:34:17 pm »
After a few changes and general messing things up I now have my system printed and am doing the final assembly work,, balancing parts and making sure the clearances are correct,, all that tedious stuff.
I did a full assembly of my test parts with a few final parts, full bearings and all that, and things worked really nice and smooth and all the motions are what is expected.
Things are looking good,, hopefully within another week or two I should have the hole system together and ready for the next step.
341
« on: September 16, 2018, 09:35:16 am »
Well,, I broke a few of my small bearings while pressing them onto there shafts, I did not see that my block had shifted onto the wrong race so I ordered more bearings, I initially only ordered enough to have spares for the setup without full bearings and would of had 1 spare bearing. I assembled my input control motor\gear and stuff and fired it up to make sure the gears and everything worked smooth enough together, one of the motors I am using was a little messed up so I did my best to fix it up,, so far so good. The actions that I have played with that have the bearings in place are very smooth and consistent, the parts work almost freely 
342
« on: September 13, 2018, 08:31:09 am »
At this point I am doing my final prints one at a time, making the part fit close enough and then making the next part to fit, building it a layer at a time if you will so that I end up with adequate clearances without having huge gaps. Some parts do not move nicely and so they need a little more room, some are really nice and don't need so much, that and with the final build things are glued and screwed and will not be able to be disassembled all the way down to the single part. This is making this move very slow, and I am getting a little frustrated and bored and over-thinking way to much with so much time on my hands,,,,, BUT, the parts I have done so far work very nicely
343
« on: September 05, 2018, 10:37:48 pm »
Here is a part I am printing right now,, this part will take 11 hours to print. The blue area is my print area,, I have kind of setup this build to use just about all of what my printer can supply I just finished printing 18 other pieces to make 2 other parts,, each of those pieces took about 7hours to print. You can almost make out some of the "improvements" I have made to my printer,, the green parts are easy but I changed to a Bowden extruder with an E3d V6 clone,, so a new print head mount and this one I designed with the parts cooling fan built in and behind the hot end\ cold end, so there is a channel that runs down behind the cold end and behind the hot end and then angles out and down to blow air onto the extrudite and the fan sits on top of it all,, you can just see the bottom of the fan housing top right,, just above the green mount,, this all bolts onto the NEMA 17 motor holes that my direct extruder used on the x-carriage,, then I added a 40C bi-metal switch to the cold end fan so it turns itself on and off, CAUTION, the bi-metal switches use the case as one contact so the case must be insulated from any electrical connection other than the fan, and I made a few more tweaks to the printer,, hopefully it will now be able to print out the rest of my parts.
344
« on: July 15, 2018, 09:38:08 am »
I think I have the final part design for most of the parts and have started printing them.
With the the limitations of my 3D printer it will be a smallish unit and even with that it is going to take a week of printing to make the parts I have designed up. I set the printer to use 0.1mm thick layers and limited the print speed to 50mm\sec in an attempt to keep the parts accurate enough for the prototype. I am printing in PLA and I think it will be strong enough to function.
345
« on: June 23, 2018, 10:47:12 am »
LIfe,,
I have been busy with my father dying from a brain tumor,, so I have not been overly involved with this project.
I am learning how to use FreeCad so that I can draw my parts and also how to use my 3D printer so I can print them,, I am also using the trial and error method of design to try and make the testbed as simple as possible while maintaining functionality and also have a full set of drawings so that any other person I share them with can print out there own parts,, I am also making it somewhat small so that it would fit easily on a desktop.
It may not be as impressive as it can be but I think it will run itself as well as power a load of some sort at the same time.
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