AbeAnd Log

Status - Done: CEB Press Code To Do: Tractor Parts - PC1708 parts & assembly - LFX & LFW BOM's Blocks: Time

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'Current Logs'

Sun Oct 8, 2017

With reworking the track units from the basic sketches up I found some of the details were different for previous builds or files were just unfinished. I'm trying to make the CAD accurate enough that with metadata it is effective for more of the documentation.

There is a variety of different documentation and examples of track discussion so there are a few small things I am unsure of.

https://youtu.be/y8efko1RZaY

I see previously washers were welded on rods and drilled for cotter pins, but I think I recall a discussion in a meeting recently suggesting bolts worked better, but cost more depending on size and grade obviously. The current CAD looks like a rod with washers on both ends. What design is planned to use for this build?

Also since 1/2" plate is being used compared to 3/4" before the gap between the links has to be narrower to minimize the roller play. I am guessing this could make certain welding methods harder. I set it about ~0.6" in the current CAD. Obviously, this affects pin length as well. I'm assuming there should be at least an 1/8" of play in the pin.

I'm moving on to solving the nesting today so I can evaluate that and report a strategy for the next meeting. There appear to be many parts and assemblies made from 1/2" sheets. There must be DXF's for many of these from previous builds so I will search for those for testing. The first step is defining a clear process and making a how-to video.

http://svgnest.com/

Considering there are so many assemblies to break down and convert the best method may be sprints so work can be divided in parallel. Experimentation with all the parts in one nesting may help determine certain patterns. Obviously, multiple sheets are required, but given the mix of geometries, it is not safe to assume ideal part mixtures for packing order. Rounding off more corners on parts may increase packing given all the circular parts. Some small parts could be nested inside other waste parts, but that requires hand optimization of DXF/SVG and order of operations through gcode or however the torch table code chain works.

Fri Oct 6, 2017

Issues with existing components of the track are making it hard to edit so I am going back through the parts and constraining and editing them to more recent standards. For small simple parts like this, I think a fully editable assembly would be nice if I can figure out an ideal working chain.

File:TrackChainLink.FCStd

added notch to track link. Also noticing the existing track unit example files are drawn with parts of various incorrect measurements like 3/4" thick rollers. Not sure what the actual specs are that have been used in the past other than logically basing it all around 1/2" plate. Probably better not to have so much slop in the rollers, but spacing the track links close to 1/2" may make them hard to weld to the track pad.

re-assembling track unit with fully editable parts constrained symmetrically for ease of future editing. spacing on the links is ~0.6"

File:Trackunit.FCStd

next steps are the 3/4" bolts needed to replace old pin design and 1/2" thick rollers. Unsure if roller specs need to be adjusted +/- 0.05" for bolts. Sounds safe to assume torch kerf will be enough.

Tues Oct 4, 2017

Researching track design further and attempting to notch the tracks without redrawing entirely, but some glitches or misalignment in the original design seem to be making that difficult. I see the pin size is also likely incorrect since the roller ID is 0.75", which seems more reasonable if as large high-grade bolts are rather expensive. I see information that the bolt size for 1" is excessive. It would be ideal to reduce sizes as much as possible to reduce waste in nesting. For nesting, there may be scraps that could have smaller parts cut out first, but this would require hand optimization of the nesting since the software is unaware what is scrap.

Mon Oct 2, 2017

Created PTO motor mount plate sketch absed of PTO motor polanar to frame. sketch still needs work.

File:PTO Motor Mount plate.fcstd

1hr

Sat Sep30, 2017

looking at PTO motors again smallest one I see still looks a little big, but I assume will work fine if flow is lower.

http://www.surpluscenter.com/Brands/Dynamic/4-95-cu-in-PTO-Drive-Motor-9-7368-80.axd

I should be able to quickly modify the previous hydraulic motor from the PC1708 into a PTO.

Researched PTO Motor and redrew CAD using previous hydraulic motor from PC17.08 as starting point. Didn't seem to save much time maybe a little. Editing flow is often confusing and/or buggy. I found no CAD or detailed diagrams so measures are rough.

PTO Motor File:PTO Hydraulic Motor.fcstd

Also needs mount to back of tractor based on rough pattern. considering torque I'm guessing 2 large high grade bolts are sufficient for shear forces.

Fri Sep 29, 2017

edited and uploaded 3 bolt hole clamp to half then made compound.

clamp halves are difficult to make a complete compound from. Parts copied or merged disappear. The method that worked this time was making half compound then copying in the pocket (one part needs to be rotated 180deg) then make a final compound from the two. simpified compounds seem to have too little information to copy or merge without bugs.

File:Idler Clamp 3 Bolt.fcstd

added clamps to master CAD

File:MT master cad.fcstd

also tried to add left motor mount and motor, but parts continue to disappear in FreeCAD.

Sep 28, 2017

changed clamp design and fit two on micro trac loader arm shaft.

Sep 25, 2017

uploaded file of larger track for wide microtrac version. Size may need further adjustment due to track path settings. the small microtrac tracks already appear too small relative to idlers. [File:MT track1.fcstd]

Going through small items on tractors.

Sep 23, 2017

updated PC 17.08 and MC CAD with holes and bolts. Surprisingly difficult to get everything well aligned and positionally correct.

added contact info to sheet.

2hrs

Sep 22, 2017

trying to check some the small things off the list on the MC CAD.

I ended up not making adjustments to shorten the motor mount plate because it appears to lower the sprocket to much, but I am not sure that is the right size either.

I've been attempting to add the holes to the PC to mount through tubing holes on the frame. Unfortunately, FreeCAD keeps behaving in strange and unexpected ways and finally crashed. I had to go back to the earlier version as I can not pocket holes through the compound for some reason. I nearly had the holes aligned before it crashed. I keep thinking I'll get used to it, but it is never as fast and simple as it should be.

Sep 19, 2017

meeting prep

checking last weeks meeting notes. adding editing Q&C to this weeks.

speed watched other half of freecad programming 101

Sep 17, 2017

edited and uploaded motor mount plate to extend height. It took longer than it should have because there was not an sketch editable version of the plate with the motor mount holes so I traced it and Fully constrained the sketch. I also see the motor mount holes can't be right so I am constraining it to the motor to find the correct hole pattern next.

File:MT motormountplate.fcstd

added mounting plate to MC master CAD. Had bugs and issues again taking longer than it should. The plate looks closer but still needs adjustment. Maybe .25 to .5" shorter. Should also triple check hole distances and sizes for all bolts even though they look ok now. I attempted to replicate the right side to left, but keep encountering bugs. The motor compound needs rework first anyway.

File:MT master cad.fcstd

3 hrs

Sep 16, 2017

adjusted tracks further and added 9 inch tracks compound to tractor master cad. Track still not perfect if accurate representation is desired, but close enough for now since other adjustments around the track still need to be made.

Also logging entries into wiki for easier accessibility until concerns with new web interface are resolved.

1hr

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