Thread: Hinge pin mechanics

This is such a great sub-topic! On my last couple razors I've been thinking about it but didn't really (still don't fully) understand.. Thank you guys for this! I'm learning a lot.
On my last razor I had a crisis point where I thought all was lost because I did not implement these concepts into my design...
My project was almost complete. Put it together with hexhead machine screws to test it (ended up keeping ALL of the hexheads because it went with steampunk look) and the blade had good tension all the way.. but would pop out when closed so would not be closed all the way. This was for the lack of curve that the lack of a wedge did not produce. I had a spacer made of wood and copper sheet. So I needed to produce a curve... instead of taking the spacer and turning into a wedge... I used another method that my design allowed. Simply adding washers.
I'm sorry I can't add pictures now, but that razor IS shared on another post.
Anyway that experience and more so all of your input is really helping me! Thanks again guys, I'm really glad that I signed up yesterday with SRP!
M

Originally Posted by bluesman7

Since the tapers are in different orientations I see no requirement for the angle to match or how the skewed angle at the wedge could help with the fit up at the pivot.
Are you talking about tang taper from heel to tail or in the spine to edge direction?

Look at a tang from the spine down. There is a taper angle that has to match the taper angle of the wedge, it does not have to be 100% but close as possible.

Originally Posted by MikeT

This is such a great sub-topic! On my last couple razors I've been thinking about it but didn't really (still don't fully) understand.. Thank you guys for this! I'm learning a lot.
On my last razor I had a crisis point where I thought all was lost because I did not implement these concepts into my design...
My project was almost complete. Put it together with hexhead machine screws to test it (ended up keeping ALL of the hexheads because it went with steampunk look) and the blade had good tension all the way.. but would pop out when closed so would not be closed all the way. This was for the lack of curve that the lack of a wedge did not produce. I had a spacer made of wood and copper sheet. So I needed to produce a curve... instead of taking the spacer and turning into a wedge... I used another method that my design allowed. Simply adding washers.
I'm sorry I can't add pictures now, but that razor IS shared on another post.
Anyway that experience and more so all of your input is really helping me! Thanks again guys, I'm really glad that I signed up yesterday with SRP!
M

Adding washers only produces a negative bend in the scales when a spacer is used.

Originally Posted by mainaman

Elaborate more please. What design requirements are you referring to?

Based on what I have read (and I may be incorrect in my interpretation), it is fine to use a spacer, instead of a wedge if there is no taper to the tang. If I am mistaken, then please correct me. I am not a restorer, nor an engineer, but I see no issues with the "action" on the one razor I own that uses a spacer rather than a wedge, so I must assume that it is designed "properly".

Originally Posted by Orville

Based on what I have read (and I may be incorrect in my interpretation), it is fine to use a spacer, instead of a wedge if there is no taper to the tang. If I am mistaken, then please correct me. I am not a restorer, nor an engineer, but I see no issues with the "action" on the one razor I own that uses a spacer rather than a wedge, so I must assume that it is designed "properly".

That is correct, rolodave and I stated it above in the discussion.

Consider this, how many years have true wedges been used with great results and millions of razors made?
I think people that use spacers are just to intimadated to make a proper wedge.

Originally Posted by pixelfixed

Consider this, how many years have true wedges been used with great results and millions of razors made?
I think people that use spacers are just to intimadated to make a proper wedge.

Consider this, how many years have horses been used with great results and millions of tasks completed?
I think people using this newfangled internal combustion engine are just intimidated to properly train a horse.

Maybe they just want to use an equally functional, but easier to use, method.

Yes, I realized this on another razor that I restored but was not a custom, actually it took me a few razors to realize that adding washers to the pivot point does not help. The answer to the problem is not one that I have fully grasped yet but I have the rascal in my sights!!!
With this razor it was different, Im sorry that I didnt explain myself better, I was on my phone and its a pain.. My problem was putting curve into scales that I had given a spacer not a wedge and didnt want to go back and make wedge. actually I still should take it apart and do that because my fix was not complete. I utilized 2 spacers in my design and should have probably had a wedge and then still kept my mid-scale spacer... Heres a couple pics.
In the future with standard more designs I will most definitely remember the rule you guys described about the taper of the tang in relation to the taper of the wedge. Ive got a much better idea of that now thanks to you guys.

Originally Posted by Orville

Consider this, how many years have horses been used with great results and millions of tasks completed?
I think people using this newfangled internal combustion engine are just intimidated to properly train a horse.

Maybe they just want to use an equally functional, but easier to use, method.

What is your point here?

Originally Posted by Orville

Consider this, how many years have horses been used with great results and millions of tasks completed?
I think people using this newfangled internal combustion engine are just intimidated to properly train a horse.

Maybe they just want to use an equally functional, but easier to use, method.

Orville,your obviously a great fan of spacers because that is what you have,so be it, enjoy.
But to many others,they are just down right ugly