sansthelight

Archive for February, 2015|Monthly archive page

Hobo Hood

In painting, welding on February 22, 2015 at 1:34 am

I had an idea for a paint job on my welding hood.  I threw a bunch of painters tape on the helmet and sketched in my ideas.  I wanted to paint some classic hobo graffiti on the sides.  I knew that I wanted to include Herbie’s hobo under a palm tree and the Colossus of the Roads signature graffiti.  I thought I might include some of the hobo short hand signs as well.  I found some slogans that were written with the graffiti and thought that I might include one or two of them as well.  I got everything laid out on my helmet (a 3M Speedglass 9100).

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But while browsing through the photos of graffiti on the old rail cars I decided I really liked the look of the white chalk on the rusty metal of the cars.  I started thinking that maybe the hood should be painted like rust and it should probably be a little more angular than the robot styling of my Speedglass.  So  I went down to my local welding supply store and bought a basic Miller helmet for $40.  It doesn’t have the auto darkening but it does have a nice large viewing window and a slot for a cheater lens.  Most importantly it was cheap.  🙂  It was gloss black plastic which isn’t ideal.  But it was cheap.

Anyway, I scuffed it up with some sandpaper and hit it with some plastic primer and then started in on my rust paint job.  I have some specialty model paint for corrosion so I used a bit of it here and there to add to the rust effect.

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Once I was happy with that I used a paint marker to draw my graffiti.  I wasn’t completely happy with the Colossus side or the logo the first time I did them so I put some more rust paint over the top of them and drew them a second time.  Finally I hit it with some clear coat.  I managed to knick it up a bit just putting the hood back together so I need to find a better primer and clear coat at some point probably.  I will just have to see how it wears over the next little bit.

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In the mean time I’ve come up with a new idea for my Speedglass helmet.  Maybe tomorrow I will try and get it figured out.

’78 International Harvester Scout 2, part 6A

In Uncategorized on February 22, 2015 at 1:10 am

I’m not sure this is really worthy of calling part 6 but it is the beginning of the next stage of work so I guess we will jump there rather than keep updating 5.  Having said that….   let’s update the part 5 projects first.  I got the reverse lights hooked up.20150115_171241 20150115_172539

The photo on the left shows the plug for the reverse light switch on the transmission.  The other photo shows the lights on.  Brilliant!  🙂  I do need to route the wires from the plug a little bit better.  They need to be tucked up in the dash or tidied up some in the engine bay.  Right now they just run through the firewall and droop down in the engine bay before running under the firewall to the transmission.  I haven’t decided where they will end up yet so for now, they will just have to stay where they are.

Anyway on to pulling everything out of the engine bay to replace gaskets.  Up to this point I have not opened up the motor.  I have just removed accessories.  The radiator, radiator fan and the rest of the AC equipment have been taken out.  The alternator and associated brackets have been removed and the water pump, housing, and pulleys have been taken out as well as the thermostat and it’s housing.  Everything has been cleaned up and painted.  The radiator needs to be replaced and the water pump housing needs a repair.

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As you can see on the last photo I found where the coolant leak was coming from.  Luckily that connection is threaded so I can just unscrew it and replace it with a new part.  The housing itself is next to impossible to find so I’m very happy that I don’t need to replace the whole thing.   I still need to figure out how to remove the water pipes on the housing so that I can replace the o-rings and gaskets on them.  One of the water pipes is a little bit worn on the end that connects into the block.  I think that I can live with it as the bit that is worn down is past the flange and o-ring and is essentially just the bit that hangs out past them in the hole on the block.  But I might need to replace the water pipe or figure out some way to repair it.  That’s it for now.  Work does continue slowly.  Between class, my new job, some rain, and some extracurricular activities the last few weekends I haven’t had much time for the Scout but I work on it as I find time in between everything else.  The head covers and intake manifold are next.  Depending on what I find I might not open up the motor anymore than that.  I do need to replace the oil pan gasket and the differential gaskets as well though.

MakersFarm Prusa i3 update (3d printer)

In 3D Printing, Arduino, RAMPS, troubleshooting on February 16, 2015 at 8:13 pm

A little while back I replaced the nozzle and ordered the wrong size.  So I had ordered a new spool of abs in the new size.  Yes, I know I could have just returned the incorrect part and keep using the spools I already had on hand.  I made the conscious decision to try the new wire size to see if there was any difference in the prints.  I don’t really expect one but with the narrower wire the printer will have to push it through at a higher speed and the wire will melt a little faster with smaller diameter.  Essentially it will work a little differently and I just wanted to see what the difference in the end result will be.  Anyway, it’s hooked up and appears to be working.

I’ve had problems with the circuit boards heating up and shutting themselves down for a long time now.  My cousin attempted to treat the symptom by adding a fan to cool the boards.  This worked sort of.  Most of the time it would allow the printer to achieve the temps it needed (getting to the print bed temp was the big problem).  Lately though it was failing more and more often and finally I just couldn’t get it to work at all.  I have done very little printing on it over the last year or so due to the problems so this isn’t something that allowed me to reach my earlier levels of productivity, it was just a stop gap fix that would let me print for a few hours every month or so.

I ran across a site selling RAMPS (RepRap Arduino MEGA Pololu Shield) boards the other day.  The shield is a board that attaches to an Arduino board and allows the Arduino to control a 3d printer.  It has all of your power inputs and outputs and uses Pololu stepper drivers to control micro-stepping of the motors.  My guess is that the RAMPS was what was having heat issues because that is where the connection block for the main power blew out on initially.  (see some earlier posts on that problem and my repairs to install a new a block.)  I decided to order a new RAMPS.  It arrived Friday just as I was walking out the door to go to LA for the weekend.

Last night I got it installed on the printer and hooked up all the wires exactly where they were on the old board.  It turns out that nothing on the new board is wired up in the same sequence as the old board.  The power outputs for the bed heater and the hotend heater are reversed.  I discovered that right away.  I fixed that this morning and made another attempt to fire the printer up.  It turns out that the stops for the the axis of movements  or possibly the motor outputs (or both) are also not in the same order.  I discovered this as my print head moved across in the Y axis and slammed into the stop and then kept trying to move.  I don’t think it will be difficult to fix, just a bit time consuming as I need to hook up the printer to the computer and test each axis of motion and then each stop sensor.  Then I will need to swap the incorrect wires around.  First though I need to summon up the energy to actually do the troubleshooting.  Maybe this evening I will get to it.  I tend to be more focused in the evening and deal better with issues like this later in the day.

I am taking a class for Solidworks and am working on a couple of personal modeling projects in addition to the school work.  Once I get the printer up and running and am able to do some initial prints of the new models I will post an update on them.  I hope it won’t be too much longer before I am able to ramp up (pun intended) my printing output again.