Pivot reinforcement on Shadow Pattern Slipjoints

C

Cubane

Joined
Apr 16, 2007
Messages
242
Hi there,

I was wondering on how to got about making the reinforcement part around the pivot pin on a shadow pattern slipjoint. I have made one already and the method I used on that did not go very well at all. I glued some 3/16 rod into the hole I had made for the reinforcement and then attempted to drill out the 3/32 pivot hole once it was glued in. Needless to say the rod started spinning and after several reglueing goes at it I finally got the holes drilled. So I am looking for a better way to do it. I don't have a lathe or a milling machine, just a drill press. I tried taking some rod to a local engineering shop to get a hole drilled down the centre of it but lets just say it didn't work out very well and thankfully I didn't have to pay them to stuff up some of my supplies. I was wondering how other people go about drilling the hole in a small section of rod? The next thing I was thinking of try was getting a thick section of steel, drilling a 3/32 hole in it then using a 3/16 step drill like for corby screws drill into the steel so I have an alignment hole for the 3/32 drill and using a grub screw or something to hold the rod in place while it gets drilled. Anyone go any better ideas?

Alistair
 
Not to stir anything up...

But I thought when you start a thread as..

"HOW TO"

You are supposed to tell us..."HOW TO"

Not ask question on "HOW TO"

Maybe I got it wrong...but that's what I thought...

Shane
 
shane justice said:
Not to stir anything up...

But I thought when you start a thread as..

"HOW TO"

You are supposed to tell us..."HOW TO"

Not ask question on "HOW TO"

Maybe I got it wrong...but that's what I thought...

Shane
Click to expand...

I always thought "How To" was "how do I?" and "Tutorial" was "Here is how you do .."

I'll have to see about the stand offs, just worried about matching steel to the pivot pin steel but it is a good idea

Al
 
I use a 1/16" pin on my small slipjoints with a 1/8" spacer about .002" thicker than the blade. I use drill rod to make the spacer. I made a little jig for centering the 1/16" hole. I
take a 3/8" to 1/2" thick piece of steel and drill a 1/16" hole through it then drill a 1/8" hole halfway through using the first hole to guide the bit. Then I clamp a piece of cardboard in my drill press vise and clamp the vise down so the bit is centered over the cardboard between the jaws. Drill a 1/8" hole in the vise jaws. Now you can clamp the drill rod in the vise perfectly centered below the drill. Swap in your 1/16" bit and put the little jig over the end of the rod to keep the bit from walking and you should get a nice centered hole. If you try to drill more than about 1/2" deep the bit will probably start to curve to one side but 1/2" is usually enough for 3 spacers.

To get it to the right thickness I stick the drill rod in the pivot hole in the blade and cut it off as close to flush as I can with a jewelers saw using the blade itself to guide the saw blade. Then I sand the whole thing flat on a surface plate with 220 grit putting pressure only on the spacer. Sand until both sides are flat and the spacer is .001 to .002 thicker than the blade stock. Oh yeah, this is all done after the blade is surface ground but before it is hand sanded.
 
Thanks Jason,

That is pretty much what I was trying to describe something like that. I'll have to see what I can rig up.

Al
 
Cubane said:
I always thought "How To" was "how do I?" and "Tutorial" was "Here is how you do .."Al
Click to expand...

If you whant to know how do I why not just say How Do I instead of how to?

Now for how to. if you want to have a reinforced area then considering your lack of equipment I think it would be easier to just buy premade bushings. they can be had from several suppliers. But how is putting a bushing in a slip joint going to make it stronger? If you have a blade with a 3/8ths tang and drill a hole that is 3/32 diameter in it you will still have 9/32nds of material around it. But if you take that same 3/8ths tang and dril a 3/16ths hole in it you only have 3/16ths or 6/32nds around it or 3/32nds less material for strength around it.
 
sorry I missunderstood your question. But I would still use premade bushings if I didn't have a lathe.
 
Cubane is this what your trying to do ? Folder without bolsters ?

If I can help just let me know. Glenn




picture.php
 
heatride said:
Cubane is this what your trying to do ? Folder without bolsters ?

If I can help just let me know. Glenn




picture.php
Click to expand...

Yes that is what I am trying to do. I did say shadow pattern didn't I? :D

IMG_1503small.jpg


That is the first one I made but I had a hell of a time drilling the hole in the reinforcement around the pivot pin hole. I wasn't talking about putting a bushing for the blade to pivot around. I took some rod to an engineering shop for them to drill on hole through an their lathe but they butchered it up. I am going to try the method Jason suggested for now. On my first one I ended up doing something similar. I glued the rod into my liners then held the remainder in my drill press vice but it still got so hot the glue no longer worked. So I am looking for a better way.

Alistair
 
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