GMK Posted May 31, 2022 Author Share Posted May 31, 2022 Did manage to complete the lower hull & ramp, ready for printing. This is what the .stl file of the lower hull looks like. Lower hull & ramp put into the slicer, sliced & ready for export to the printer… Only 399 hours! Ah well, at least I can’t blame anyone else for errors & omissions. dodgem37 1 Link to comment Share on other sites More sharing options...
Ryan Posted May 31, 2022 Share Posted May 31, 2022 On 5/21/2022 at 11:36 PM, GMK said: Thanks Mark. I’m using 1:1 dimensions from a vehicle in storage & the AFV Club 1:35 kit. Pending verification of the depth of the rear lights & the Jerry can holders, the rear hull plate & ramp are done. The addition of the front tow points has more or less completed the lower glacis plate on the front. Work has commenced on the cargo hatch with air filter box & the voids in the underside for the M8 mounting bolts. I’m travelling this week, which will hamper progress. Thanks for looking in. Iv'e often thought the best way to do one of these scratch builds is to buy a sacrificial kit and scale it up, essentially using it as a form of drawing. Sorry is this has been asked before but what CAD and 3d Printer are you using? Fantastic work - Ryan. GMK 1 Link to comment Share on other sites More sharing options...
GMK Posted June 1, 2022 Author Share Posted June 1, 2022 17 hours ago, Ryan said: Iv'e often thought the best way to do one of these scratch builds is to buy a sacrificial kit and scale it up, essentially using it as a form of drawing. Sorry is this has been asked before but what CAD and 3d Printer are you using? Fantastic work - Ryan. Thanks, Ryan. I agree - a model kit is very handy to clarify how the parts interact. Two dimensional pics are great, but they are a bit limited. I’m using Fusion360 for the CAD, which generates a .stl file, Luban as a slicer to generate the gcode for the printer, with the printer being a large formfactor filament one. Link to comment Share on other sites More sharing options...
Ryan Posted June 1, 2022 Share Posted June 1, 2022 Thanks GMK, I have F360....now need the printer! Ryan GMK 1 Link to comment Share on other sites More sharing options...
GMK Posted June 4, 2022 Author Share Posted June 4, 2022 (edited) While the hull & ramp print away, I’ve got an opportunity to draw up the roadwheels, idlers, & drive sprocket. With CAD, the cross section of the wheel is the important bit. Thanks to some help from the brain’s trust, a section of the roadwheel emerged. Good enough to use as a canvas & scale to 1:16. Then the line drawing is used as a basis to sketch. Click on the Revolve function, choose the axis & boom: one roadwheel. Here’s a snapshot of two attempts: one without the section (left), one with (right). There’s been some detailing around the hub, & the rivets around the outside of the wheel, but they’re pretty simple to add. I stole the idlers from work I did on the AS4 last year. Thanks for looking in. Edited June 4, 2022 by GMK dodgem37, TankBuster, Daniel Leduc and 1 other 4 Link to comment Share on other sites More sharing options...
Daywalker Posted June 4, 2022 Share Posted June 4, 2022 Very impressive project, I will be watching for more on this one! GMK 1 Link to comment Share on other sites More sharing options...
GMK Posted June 4, 2022 Author Share Posted June 4, 2022 10 hours ago, Daywalker said: Very impressive project, I will be watching for more on this one! Thanks Daywalker, I appreciate the feedback. The last pieces of the running gear before the track are the sprocket ring & sprocket wheel. “My” vehicle ran German Diehl 513 dual pin track. 513’s track pitch is different from the single pin T130 & T130E1 normally seen on M113A1s & A2s, necessitating a different sprocket ring. Here’s the sprocket rings for the Diehl track. Ignore the floating! I’m not 100% on their width, but good on everything else. A wider view: And a lower one that makes the lack of a sprocket wheel less obvious. This is a pic of a 1:1 sprocket wheel that I’ve been describing. Thanks for looking in. dodgem37, panzerrob and Daywalker 3 Link to comment Share on other sites More sharing options...
GMK Posted June 7, 2022 Author Share Posted June 7, 2022 Managed to sort out the geometry of the sprocket wheel, including the mud relief holes. It was a little tricky. After creating the outer sprocket wheel, I mirrored it to create the inner. The inner wheel is offset by 36 degrees. Another view. Started on the Diehl track. I’ve got two 1:1 dimensions: a width of 341mm & a track pitch of 157mm. Imagine my relief when my 1:16 model conformed to those dimensions! Thanks for looking in. Daywalker, LSP_Ray, scvrobeson and 4 others 7 Link to comment Share on other sites More sharing options...
LSP_Matt Posted June 7, 2022 Share Posted June 7, 2022 Looking great mate Plenty of good references. Matty GMK 1 Link to comment Share on other sites More sharing options...
GMK Posted June 9, 2022 Author Share Posted June 9, 2022 (edited) On 6/7/2022 at 3:43 PM, LSP_Matt said: Looking great mate Plenty of good references. Matty Thanks, mate. Great thing about an ancient vehicle is that references are relatively plentiful. Also helps that I did a comprehensive photo walk around of my vehicle in East Timor in 1999! From my most recent reference trip: As the largest user of M113s, for some reason my unit ran ballistic shrouds on their vehicles. In the Australian Army, most units removed theirs. Must’ve been a mech inf thing ¯\_(ツ)_/¯. Changes the look & hides a lot of the detail in the running gear. Not quite done with them, but very close. In order to aid indexation of the ballistic shrouds onto the hull, I extruded a lip that’s perpendicular to the hull sides, parallel to the sponsons, & gapped to accept the sponson armour. Thanks for looking in. Edited June 10, 2022 by GMK Ryan, LSP_Matt, dodgem37 and 4 others 7 Link to comment Share on other sites More sharing options...
GMK Posted June 11, 2022 Author Share Posted June 11, 2022 The bareness of the glacis was starting to bug me, so I figured I’d rough out the engine access hatch cover & the prop shaft access plate*. The hatch cover doesn’t sit flush with the glacis plate itself, & is surrounded by a ballistic shield to prevent fragments getting to the engine via the gap between the two. Also tweaked the rear panel of the ballistic shrouds/side skirts, getting them ever nearer to being done. My mid-week field trip to collect references verified the overall width of the drive sprockets at 235mm on the 1:1, or 14.6875mm at 1:16. From the centreline of the track, mine were each .784mm too wide, for an overall error of 1.568mm. For context, that’s almost 10% too wide! So, I took the opportunity provided by the error to redraw the components to a higher standard. Hoping to finish the roof & tracks this week, all going well. Thanks for looking in. *specific component names may be unique to Australia &/or incorrect Ryan, TankBuster, panzerrob and 1 other 4 Link to comment Share on other sites More sharing options...
GMK Posted June 15, 2022 Author Share Posted June 15, 2022 Work continues on the hull roof & engine deck details. The 1:1 footman loops: And in 1:16: The loops are a single piece replicated & indexed to holes indented into the hull roof. Overnight, the lower hull & ramp print finished after 369-odd hours. After a little bit of cleanup & compared to the Thingiverse 6% scale “M1113.” Pretty happy with mine from both a scale & fidelity perspective. After some cleanup. Thanks for looking in. panzerrob, Cheetah11, Ryan and 3 others 6 Link to comment Share on other sites More sharing options...
GMK Posted June 19, 2022 Author Share Posted June 19, 2022 Design work continues. I’m hoping to get the hull roof & glacis plate on the printer ASAP, so they’re the priority for the design. The most work was the cargo hatch (not quite done) & the driver’s hatch (not quite done - will be a separate print). The last three items for the roof will be the fuel filler cap, antenna brush guards, & the bilge drain. Thanks for looking in. dodgem37, LSP_Matt, panzerrob and 2 others 5 Link to comment Share on other sites More sharing options...
GMK Posted June 23, 2022 Author Share Posted June 23, 2022 While the roof prints, I got busy with the glacis & trim vane. Ideally, the glacis will be the next print, with the trim vane likely done on the resin printer. Thanks for looking in. dodgem37 and LSP_Matt 2 Link to comment Share on other sites More sharing options...
GMK Posted June 23, 2022 Author Share Posted June 23, 2022 After ~79 hours, the roof is done. This is a render of the .stl file: After slicing into .gcode. The first layer… Hot off the printer. Dry fit onto the hull after initial cleanup. Thanks for looking in. dodgem37, panzerrob, Alain Gadbois and 1 other 4 Link to comment Share on other sites More sharing options...
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