Search found 753 matches

by *5 J's*
Thu Feb 20, 2014 5:14 pm
Forum: Car & Semi-Truck Construction
Topic: Drilling canted axle holes with pro body tool
Replies: 22
Views: 6302

Re: Drilling canted axle holes with pro body tool

Drilling camber and toe with a probody tool is a special case that you can fit in the tables and computations of http://www.stanpope.net/camdrill.htm . Important considerations: be careful of how the body is held ... it is too easily flexed if pressed in the center between its edge supsport, and th...
by *5 J's*
Thu Mar 28, 2013 12:56 pm
Forum: Car & Semi-Truck Construction
Topic: How to affix mesh paper to carbon rod?
Replies: 5
Views: 1853

Re: How to affix mesh paper to carbon rod?

I cut into thin strips - remove backing - then start rolling it around the rod. Once it is 3/4 of the way affixed I estimate how much more is needed to finish the wrap and cut off the excess with an X-acto knife then finish rolling. Once completely wrapped I roll the rod back and forth on a hard sur...
by *5 J's*
Sun Feb 17, 2013 12:20 pm
Forum: General Car/Truck Racer Topics
Topic: Does Sequence of Polishing Operations Matter?
Replies: 51
Views: 7725

Re: Does Sequence of Polishing Operations Matter?

Stan, While I don't think many have "real" world experience with what your asking...(nor do I).... You will likely get lots of opinions mostly geared toward "X" grit = "X" grit, what difference does it make which direction it is accomplished? Wish I had a better microscope than a toy as I would go ...
by *5 J's*
Sat Feb 16, 2013 9:39 pm
Forum: General Car/Truck Racer Topics
Topic: Does Sequence of Polishing Operations Matter?
Replies: 51
Views: 7725

Re: Does Sequence of Polishing Operations Matter?

I take the question as - if you started with a 120 micron finish axle then polished using 64 micron, then 32, then 16 then, 8, then 4, then fininshing with 2 micron. Now take that axle polished to 2 micron and "scratch it up" with 4 micron, then 8, then finishing with 16 micron. Would the axle this ...
by *5 J's*
Sat Feb 16, 2013 9:29 pm
Forum: Car & Semi-Truck Construction
Topic: drag?
Replies: 4
Views: 875

Re: drag?

sporty wrote:3m clear tape, works just fine, some use aluminuim tape.
:thumbup:
by *5 J's*
Sat Feb 16, 2013 9:27 pm
Forum: Car & Semi-Truck Construction
Topic: Drilling Disaster
Replies: 4
Views: 1144

Re: Drilling Disaster

My #44 drill bit is now prominently painted red at the base. Apparently I own another slightly larger black bit! I did not enjoy finding this out after I drilled out the axle slots on a couple of finished cars! Lesson learned the hard way! Been there done that. Using different sized axles I have di...
by *5 J's*
Fri Feb 15, 2013 5:30 pm
Forum: Car & Semi-Truck Construction
Topic: Shaving the DFW side
Replies: 6
Views: 1824

Re: Shaving the DFW side

What is the best way to shave the DFW side? Is it just a notch that goes back just behind the front wheel, or is it on an angle from the front of the car to the rear? Your preference - I square it off until 1/2" behind the axle hole - then taper it to 1/2" in front of the rear axle. But again, that...
by *5 J's*
Thu Feb 14, 2013 10:21 pm
Forum: Electronics
Topic: Solenoid Start Gate Circuit
Replies: 81
Views: 23346

Re: Start Gate

5 J's, I'm working on testing just the manual start switch of my gate release. When I connect power, the solenoid trips and stays latched. IF I remove the wire that connects D2 and R1 to the gate of Q1, the start switch works great - although I haven't checked the connection to the serial port. Any...
by *5 J's*
Thu Feb 14, 2013 2:02 pm
Forum: Car & Semi-Truck Construction
Topic: Marking axles: where to place mark
Replies: 11
Views: 1600

Re: Marking axles: where to place mark

I like to make a mark all the way across the DFW - make a kgroove and then you can use a screwdriver to adjust steer. It's simply a slot cut across the axle. When you bend the axle - bend it along the same line as the groove.
by *5 J's*
Thu Feb 14, 2013 1:57 pm
Forum: Car & Semi-Truck Construction
Topic: Comparison of wheels on track and with car lifted?
Replies: 11
Views: 1586

Re: Comparison of wheels on track and with car lifted?

The camber above looks to be approximately 3 degrees. That is a good number for negative cant. We use a bit more positive cant on the DFW.
by *5 J's*
Thu Feb 14, 2013 1:03 pm
Forum: Electronics
Topic: Solenoid Start Gate Circuit
Replies: 81
Views: 23346

Re: Start Gate

simply put a lighted switch in series with SW1. When switch SW1 is closed switch 2 will light. When switch 2 is depressed, the solenoid will activate. In series both need to be depressed - if in parallel solenoid will activate is either is depressed.
by *5 J's*
Thu Feb 14, 2013 8:59 am
Forum: Electronics
Topic: Solenoid Start Gate Circuit
Replies: 81
Views: 23346

Re: Start Gate

A few things to take into account - this is a 12V soleniod, not a 120V - and there is a reversed biased diode in parallel with the soleniod to shunt any field collapse from the soleniod. The R1 resistor also filters any noise. It is a pretty basic and standard circuit with nominal protection built ...
by *5 J's*
Wed Feb 13, 2013 7:41 pm
Forum: Electronics
Topic: Solenoid Start Gate Circuit
Replies: 81
Views: 23346

Re: Start Gate

They would still be at the same point electrically. I would hope that to be the case. Though, I do wonder if there should be an optoisolator included in the circuit to protect the computer's serial (or USB) port from any possible damage. A few things to take into account - this is a 12V soleniod, n...
by *5 J's*
Wed Feb 13, 2013 2:18 pm
Forum: Electronics
Topic: Solenoid Start Gate Circuit
Replies: 81
Views: 23346

Re: Start Gate

Hmm - never tried it with out having a ground on pin 5. I assumed the open start gate trigger at pin 4 needed this ground. I need to build another start gate for a new track soon - guess I'll try leaving this out and see. I wasn't saying not to use Pin 5 for ground. Just only use it on the trigger ...
by *5 J's*
Wed Feb 13, 2013 1:59 pm
Forum: Electronics
Topic: Solenoid Start Gate Circuit
Replies: 81
Views: 23346

Re: Start Gate

Do I connect all the grounds to the -12VDC or just to pin 5 of the serial port? I'm not an Electrical Engineer, but I don't think that you want to connect the ground of the power side of the solenoid to the serial port ground (pin 5), just the trigger part of that circuit (the one shown coming off ...