Leather cup stitching problem!

[toxo]

Still working on my tea cup koosie/kuzie and I've run into a problem. If you use the same punch/chisel for the main body and the bottom piece you are going to run into trouble because the main body has a bigger diameter/circumference than the bottom piece so if you don't allow for it by the time you run out of stitch holes in the bottom piece you still have some left on the main piece and a big bulge as well.     

Now being a bit mathematically challenged I turned to YouTube. I could only find one vid that advocates sort of dropping stitches when the holes are no longer opposite each other and I think I remember Armitage saying the same thing years ago. This doesn't work because when you start out the holes ARE opposite each other and the problem doesn't arise until it's too late to do anything about it.

I know the answer is somewhere in the PCD math (Pitch Circle Diameter) but I don't have the noodles to be able to work it out. BUT there are not many problems that Paulie can't work out eventually and I've come up with a cunning plan. I know the answer is to have the same amount of holes in both pieces which means the holes in the bigger piece have to be farther apart so todays plan is to use the sewing machine. I'm gonna draw the bigger circle and because I already know how many holes there are in the bottom piece I'm gonna change the stitch length on the machine until I have the same amount of holes.

If there's someone out there who knows how to work this out using to math please let me know.

[chuck123wapati]

1 hour ago, toxo said:

Still working on my tea cup koosie/kuzie and I've run into a problem. If you use the same punch/chisel for the main body and the bottom piece you are going to run into trouble because the main body has a bigger diameter/circumference than the bottom piece so if you don't allow for it by the time you run out of stitch holes in the bottom piece you still have some left on the main piece and a big bulge as well.     

Now being a bit mathematically challenged I turned to YouTube. I could only find one vid that advocates sort of dropping stitches when the holes are no longer opposite each other and I think I remember Armitage saying the same thing years ago. This doesn't work because when you start out the holes ARE opposite each other and the problem doesn't arise until it's too late to do anything about it.

I know the answer is somewhere in the PCD math (Pitch Circle Diameter) but I don't have the noodles to be able to work it out. BUT there are not many problems that Paulie can't work out eventually and I've come up with a cunning plan. I know the answer is to have the same amount of holes in both pieces which means the holes in the bigger piece have to be farther apart so todays plan is to use the sewing machine. I'm gonna draw the bigger circle and because I already know how many holes there are in the bottom piece I'm gonna change the stitch length on the machine until I have the same amount of holes.

If there's someone out there who knows how to work this out using to math please let me know.

just use the chisel on the main body glue the bottom on and finish the hole through with an awl. No math is needed friend.

bevel the edges so the two pieces fit together properly before glueing.

 

[chuck123wapati]

the best way is to just mark your holes on the main piece then use an awl through both pieces after glue up. bevel both pieces at 45 degrees and your thread should not show inside the cup but go through the beveled area only.

[chuck123wapati]

i should turn some wood and makes some koozie forms for folks, i just grabbed a tree limb and cut off a piece one day for a sewing form but a nice turned one the right size would be better.

[toxo]

33 minutes ago, chuck123wapati said:

just use the chisel on the main body glue the bottom on and finish the hole through with an awl. No math is needed friend.

bevel the edges so the two pieces fit together properly before glueing.

 

Works fine on 3mm firm veg tan. Not so much on 2mm soft chrome. This is just a holder. Doesn't have to be watertight. I could just put a cross on the bottom.  It's the principle I'm after.

[chuck123wapati]

18 minutes ago, toxo said:

Works fine on 3mm firm veg tan. Not so much on 2mm soft chrome. This is just a holder. Doesn't have to be watertight. I could just put a cross on the bottom.  It's the principle I'm after.

It works the same if you have a form to sew on.

If the leather is that thin then the difference in circumference isn't very much between the two pieces but your making it way to hard for no need. 

Another way, get a compass and draw a circle the same size as the bottom circumference. Draw a second circle the size of the main body circumference.  mark your intended holes on the inner circle then with a ruler mark lines from the  center of the circle through your intended stitching pattern to the outer circle. this will give you the measurement you want. easily and quickly. The problem with finding that "principle" is that the distance from the edge of the leather to the hole is part of the equation as well as the thickness of the leather so you have more than one variable to the equation. you will see and understand this problem better when you make the above template.

[chuck123wapati]

44 minutes ago, toxo said:

Works fine on 3mm firm veg tan. Not so much on 2mm soft chrome. This is just a holder. Doesn't have to be watertight. I could just put a cross on the bottom.  It's the principle I'm after.

 

[Frodo]

You have 2 parts. The outside piece of leather and the inside piece of leather

4" circles circumference is 12.56"

so the back side of the outter piece is 12.56"

the front side of the inner piece is 12.56"

that's is assuming your bottom is fitting inside the top 

That is how I figured this jewelry box

i used my sewing machine with out thread to make the holes in both pieces  

glued the plug inside the outter piece  using bits of wire to align holes  while glue set up

then sewed it,  using an awl when needed 

 

[chuck123wapati]

15 minutes ago, Frodo said:

You have 2 parts. The outside piece of leather and the inside piece of leather

4" circles circumference is 12.56"

so the back side of the outter piece is 12.56"

the front side of the inner piece is 12.56"

that's is assuming your bottom is fitting inside the top 

That is how I figured this jewelry box

i used my sewing machine with out thread to make the holes in both pieces  

glued the plug inside the outter piece  using bits of wire to align holes  while glue set up

then sewed it,  using an awl when needed 

 

excellent work!! and now brings up the question how are you connecting the two pieces?? . Butted up together like with thicker leathers , formed inside like Frodos,  formed opposite of Frodos or some other method ? maybe a pic of what you are trying to do would help.

[toxo]

1 hour ago, chuck123wapati said:

 

Well done Chuck. That'll do it.