Gerard's Shaper Design

[sasquatch]

Doing research on my own shaper, i found posted that a shaper was first invented in 1836 ?

[4R8]

(11-21-2012, 11:09 PM)f350ca Wrote: Jason, post 19 shows the mechanism. i think its called a Scotch yoke. The slider can be adjusted out from center on the rotating disk to vary the stroke length. Neat mechanism, it cuts with the pin on the top half of the disk and returns faster with the pin on the bottom half.

Yep, that's the post I was referring too.
Thanks for the explanation. The quicker return now makes sense also.
So to clarify, if you had the motor run backwards, the cut stroke would be the quicker (and weaker) stroke. Correct?

[f350ca]

Yep

[Gerard]

Hello
Here are some pictures how you can make bevel gears.
I know that the teeth are not perfect but for slow rotating parts they are certainly good enough.

Cutting the bevel gear on the lathe
   

Milling the teeth
   

On this picture the gunk on the teeth is black grease.
   

Gerard

[EdK]

Thanks for the pictures Gerard. What kind of steel did you use for the bevel gear?

Ed

[Gerard]

(11-23-2012, 04:31 PM)EdK Wrote: Thanks for the pictures Gerard. What kind of steel did you use for the bevel gear?

Ed

Ed

I have used 42CrMo4 steel. This is very good steel for making gears. The gears for the gear box of my shaper are also made from this kind of steel. I could buy a lot of leftovers for about 2.2 Euros/kg ($1.5/pound).

Gerard

[EdK]

(11-23-2012, 04:44 PM)Gerard Wrote:

(11-23-2012, 04:31 PM)EdK Wrote: Thanks for the pictures Gerard. What kind of steel did you use for the bevel gear?

Ed

Ed

I have used 42CrMo4 steel. This is very good steel for making gears. The gears for the gear box of my shaper are also made from this kind of steel. I could buy a lot of leftovers for about 2.2 Euros/kg ($1.5/pound).

Gerard

Gerard,

How does that steel machine? It looks like you got a good finish on it.

Ed

[Gerard]

(11-23-2012, 05:00 PM)EdK Wrote:

(11-23-2012, 04:44 PM)Gerard Wrote:

(11-23-2012, 04:31 PM)EdK Wrote: Thanks for the pictures Gerard. What kind of steel did you use for the bevel gear?

Ed

Ed

I have used 42CrMo4 steel. This is very good steel for making gears. The gears for the gear box of my shaper are also made from this kind of steel. I could buy a lot of leftovers for about 2.2 Euros/kg ($1.5/pound).

Gerard

Gerard,

How does that steel machine? It looks like you got a good finish on it.

Ed

Ed

It is a hard kind of steel steel. The machining is very good with carbide inserts and at high speed (1600-2000 rpm/min). The surface then shines as a mirror. This steel can also be hardened and tempered. It is best to machining kind of steel that I have used so far

Gerard

[sasquatch]

Nice pics and follow up on the bevel gears, thanks for posting this.

[DaveH]

Gerard,
Very nicely made

DaveH