Search found 384 matches

by thomas harris
Tue Feb 12, 2013 4:29 pm
Forum: The Junk Drawer
Topic: basic geometry of linkages explained to caveman
Replies: 12
Views: 1928

Re: basic geometry of linkages explained to caveman

i think i see some daylight on this now. basically more distance between those links means more distance of travel in a straight line, but this changes very little with small distances between the links. so should i intentionally put some extra slop in the pins to allow maximum lateral movement?
by thomas harris
Tue Feb 12, 2013 7:45 am
Forum: The Junk Drawer
Topic: basic geometry of linkages explained to caveman
Replies: 12
Views: 1928

Re: basic geometry of linkages explained to caveman

that shows the parts, and shows it does work, but it doesn't dwell on the way the parts interact to achieve the movement.
by thomas harris
Mon Feb 11, 2013 11:11 pm
Forum: The Junk Drawer
Topic: basic geometry of linkages explained to caveman
Replies: 12
Views: 1928

basic geometry of linkages explained to caveman

I am trying to design a simple peck drilling rig for my small lathe. It has been some time since geometry or trig, so things are rusted solid up there. Is there a tutorial online or elsewhere which will provide the basic principles of moving a piston forward with a lever system explained. I am havin...
by thomas harris
Mon Jan 28, 2013 4:24 pm
Forum: The Junk Drawer
Topic: caveman electronic repairs
Replies: 10
Views: 1512

Re: caveman electronic repairs

Being old enough to remember "breadboard" electronics, where every component had at least two connections, I have a real appreciation for connection points, and a story. Modern IC electronics are so incredibly reliable that the history of the technology involved has been largely forgotten, almost i...
by thomas harris
Sun Jan 27, 2013 8:16 pm
Forum: The Junk Drawer
Topic: caveman electronic repairs
Replies: 10
Views: 1512

Re: caveman electronic repairs

When one thinks about the small size of the wires, the number of conductors on most plugs and the fact that they have three spots- each side of the plug and the plug itself- it's no surprise. Just add humidity, time, and poor assembly and you got an excessive or infinite resistance through one of th...
by thomas harris
Sun Jan 27, 2013 7:33 pm
Forum: The Junk Drawer
Topic: caveman electronic repairs
Replies: 10
Views: 1512

Re: caveman electronic repairs

shh! i still need to send the kids to medical school. don't tell about the wall plug, or pups chewing on low voltage power cords. our second dachshund has kept me busy redoing data cords for the computer stuff. some of those device specific cords are outrageously priced. many of our cords are sligh...
by thomas harris
Sun Jan 27, 2013 5:40 pm
Forum: The Junk Drawer
Topic: caveman electronic repairs
Replies: 10
Views: 1512

caveman electronic repairs

as a bonified caveman i must say that it amazes me how many high tech electrical things a moron like me can fix. I never realized just how commom a failed connection is inside the covers of so many devices. I have very limited knowledge of electrical/electronics but my "go to" is always that of exce...
by thomas harris
Fri Jan 25, 2013 12:53 pm
Forum: The Junk Drawer
Topic: Damned dipstick
Replies: 9
Views: 1618

Re: Damned dipstick

breaking is what mechanical things do best. so don't beat yerself over it.
by thomas harris
Fri Jan 25, 2013 10:07 am
Forum: Lathes
Topic: keeping very small diameter hole concentric in brass
Replies: 10
Views: 1135

Re: keeping very small diameter hole concentric in brass

after a bit more research i tried some new things. i used a stiffer 1/8" starter first, then chucked my .040. I also used a peck drilling technique.(to keep the chips from binding and causing the drill to wander?). anyway it did seem to produce much better results. i may go so far as to make a lever...
by thomas harris
Wed Jan 23, 2013 11:15 pm
Forum: Lathes
Topic: keeping very small diameter hole concentric in brass
Replies: 10
Views: 1135

Re: keeping very small diameter hole concentric in brass

Glenn Wegman wrote:I'm not sure what you mean by "my tailstock wants to ride all over the place". The tailstock should be stationary and locked down.
i mean the bit itself inside the chuck. no the tailstock is not actually moving.
by thomas harris
Wed Jan 23, 2013 7:08 pm
Forum: Lathes
Topic: keeping very small diameter hole concentric in brass
Replies: 10
Views: 1135

keeping very small diameter hole concentric in brass

I am trying to make some lure bodies for my spring steelheading. With a simple form cutting tool the shape doesnt seem to be very difficult and I can jig it to make it bearable in terms of time, but drilling a .040 inch hole through it has me stumped. How does one do this. My tailstock wants to ride...
by thomas harris
Fri Dec 28, 2012 7:28 am
Forum: The Junk Drawer
Topic: babies
Replies: 3
Views: 1042

Re: babies

My belief is that we are born sinners and act as such. Some are appalled and offended by this, but it is my belief.