Print PDF
Favorite
Email
Step 4Making the tapswitch
In this step we well make the pieces for the tap switch. The tap switch is used to select from the different sections of the coil using the loops/ taps made when we wound the coil. If you decide you do not want to make the tap switch from scratch you can use a rotary switch instead. Also in the next step I am going to show how to make the cats whisker detector, this was one of the first types of detectors invented for use in radios, it uses a piece of mineral, like galena or in my case iron pyrite, and a fine wire to act as a simple diode. If you do not want to make the detector by hand you can use a common 1N34 germanium diode available from Radio Shack instead.
To make the tap switch you well need:
- strip of thin copper or brass 3/8" wide
- one 2" long screw
- one 1" long piece of dowel
- one hex nut
- one washer
- super glue
- paint or stain and lacquer
Tools:
- tin snips
- drill
- metal file
- pliers
- paint brush
1) Using a ruler and utility knife score a line 3/8" of an inch from one end of you sheet of copper.
2) Using tin snips cut the strip out along the line and re-flatten the strip with a hammer on a hard surface.
3) Cut the strip to 1-9/16" long.
4) Mark the strip 3/8" from one end all the way across. At the other end of the strip opposite the end you just marked measure in from each side 1/16" along the top. scribe a line from the marks on the top to the line 3/8" from the bottom and cut along the line with tin snips, this tappers the pointer down to 1/4" at the top. See forth picture.
5) Use a file to clean up the edges and round the ends of the pointer.
6) Cut a piece of dowel 1/2" long and drill a hole 5/32" down the center.
7) Holding a the dowel in position on the pointer use a nail in the center hole of the dowel to make a mark and drill a 5/32" hole through the pointer at that mark.
8) Slide a washer over the 2" long screw and then slip the dowel and pointer on after. Using a small drop of super glue, glue the pointer to the dowel and thread the nut onto the screw and tighten the nut.
9) You can either paint the knob, stain it like I am doing or just clear coat it and keep it the natural color of the wood.
To make the tap switch you well need:
- strip of thin copper or brass 3/8" wide
- one 2" long screw
- one 1" long piece of dowel
- one hex nut
- one washer
- super glue
- paint or stain and lacquer
Tools:
- tin snips
- drill
- metal file
- pliers
- paint brush
1) Using a ruler and utility knife score a line 3/8" of an inch from one end of you sheet of copper.
2) Using tin snips cut the strip out along the line and re-flatten the strip with a hammer on a hard surface.
3) Cut the strip to 1-9/16" long.
4) Mark the strip 3/8" from one end all the way across. At the other end of the strip opposite the end you just marked measure in from each side 1/16" along the top. scribe a line from the marks on the top to the line 3/8" from the bottom and cut along the line with tin snips, this tappers the pointer down to 1/4" at the top. See forth picture.
5) Use a file to clean up the edges and round the ends of the pointer.
6) Cut a piece of dowel 1/2" long and drill a hole 5/32" down the center.
7) Holding a the dowel in position on the pointer use a nail in the center hole of the dowel to make a mark and drill a 5/32" hole through the pointer at that mark.
8) Slide a washer over the 2" long screw and then slip the dowel and pointer on after. Using a small drop of super glue, glue the pointer to the dowel and thread the nut onto the screw and tighten the nut.
9) You can either paint the knob, stain it like I am doing or just clear coat it and keep it the natural color of the wood.
| « Previous Step | Download PDFView All Steps | Next Step » |
1
comment
|
Add Comment
|
1
Sep 26, 2010. 3:54 PMriverreaper
says:
does the floor jack hold your table up
Reply
 |
Add Comment
|
