Thread: Douglas shaper ratchet

Hi all,
After spending the day messing around with Mars's motor mount, which turned out to be the source of a lot of my vibrations (the mount had come loose) i felt i needed to do something productive. And test out the head with .002" less shim in the front bearing.

Aha! James's ratchet gear. Anyway, i cut, faced, drilled and reamed the stock, then put it on an arbor and skimmed it. 20min work...but it felt good to get something done that wasn't chasing my tail.

Anyway, the question is, does anyone else think their Douglas will need one soon? Once set up it will be pretty easy to make a few.

Cheers,
Ew

Good work Ueee.
I suggest you make 3 of them and let the Douglas fraternity know.
All of us have the risk of knocking off a tooth any time.... I'v got in the habit of tightening the feed bolt on the the bull gear crank plate only to stay there for "normal" operations and slide into the middle if something crashes or jams (happens frequently to me). If that bolt is more than hand-tightened and you get the angle of the pawl arm wrong, the pawl can just shear a tooth straight off..... Mine was missing to when I got it - and I figured out pretty quickly how the failure mode works....

For those interested

The gear has 24 teeth, and the bore is 3/4"

Originally Posted by jhovel

Good work Ueee.
I suggest you make 3 of them and let the Douglas fraternity know.
All of us have the risk of knocking off a tooth any time.... I'v got in the habit of tightening the feed bolt on the the bull gear crank plate only to stay there for "normal" operations and slide into the middle if something crashes or jams (happens frequently to me). If that bolt is more than hand-tightened and you get the angle of the pawl arm wrong, the pawl can just shear a tooth straight off..... Mine was missing to when I got it - and I figured out pretty quickly how the failure mode works....

Put me on the shopping list please Ewan. Little Dougie be happy to shout a few ''Mars Bars'' Cheers. John.

Hi Ewan,

I'll register my interest, although I'd use it not on a Douglas but on another machine.

Thanks,
Joe

Hi Ewan
Wow! I'm excited, and watching with interest and anticipation

My little douglas is currently toothless..

the "James"

Thanks.


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Hi Uee,
I would suggest you harden and temper/case harden the ratchet gear because on my Douglas the pecker is hardened and it is wearing away the gear wheel. Douglas does get used a lot though.
Regards,
Borriss

Ewan, so that the information is preserved for posterity, perhaps you can post a dimensioned sketch and photo. That way at least someone looking at this thread in the future who needs a gear will know the size and form. Mike's 24t and 3/4" bore is a start but not quite a full description I suspect.
As all the shapenistas will tell you, a shaper is ideal for cutting a keyway and the recipients could probably cut their own as it will not require a ratchet. However, for a bore that small I more than likely have a broach & bush that will do the job if you need to borrow...

Michael

Originally Posted by Michael G

Ewan, so that the information is preserved for posterity, perhaps you can post a dimensioned sketch and photo. That way at least someone looking at this thread in the future who needs a gear will know the size and form. Mike's 24t and 3/4" bore is a start but not quite a full description I suspect.
As all the shapenistas will tell you, a shaper is ideal for cutting a keyway and the recipients could probably cut their own as it will not require a ratchet. However, for a bore that small I more than likely have a broach & bush that will do the job if you need to borrow...

Michael

Good idea Michael, i'll take a pic of the sketch and post it. There is no keyway to cut, the ratchet is pinned in place.

I only had enough steel for 4, so unless it won't suit Joe's machine that all of them accounted for.

After Ray and Josh's visit, including obligatory swapping of vices, steel, drill presses etc, i finished turning the ratchets ready to have the teeth cut. I also made a length of steel for aligning the D/H and my new vice to the mills table (i'm sure there is a proper name for it?) As luck would have it they were both 5/8 wide slots, Mlle's are 16mm. Some step grinding and they were done. I like my grinder......weeeeeeee.

Thanks Greg for the vice, she is a real beauty, you can really feel the difference between it and the chinese ones.

Ew

They grew teeth!

Yep spent some boring time this arvo cutting the 24 teeth for each one. I could do 2 at once but it still took some time.
The D/H sure looks big on Mlle, but it is soooooo rigid.

I'm not sure about case hardening the teeth. I think they would then wear the pawl at a faster rate. The Queens gear and pawl are both soft. Thoughts?
Before you ask the angle plate is there as a coolant splash guard.
Cheers,
Ew

Neat work Ewan

You have some nice machines to play with .

Do we send you some $ for postage ?

Mike

Coolant - Huh! You're spoiling that machine.
Looks good all together though. While the D/H looks big, they are and it's probably around the size that Mlle's makers would have designed for.

Michael

Do you think it'd be possible to have a ratchet with more teeth?
Could get a finer feed rate?

Jordan

Ew,

Looks like the arbors came up OK.

Ken (who is currently stuck on the spiral bevel gear repair on the mistress.)

I'm glad i didn't have to repair any spiral gears Ken, all my gears were ok, but then i have a telescopic Z screw. I'm pretty sure the machine Phil has at the hill has the same issue with the Z screw......makes you wonder what they were thinking. Hell, even my 90? 100? 105? yr old shaper has a telescopic z screw!

James and John, i have your addresses so i'll get them away, i figure it best to drill the pin hole in place. Mike, i thought i had yours but can't seem to find it, PM me.

Joe, if the ratchet suits let me know and i'll get one way to you.

There may be some de-burring of the teeth needed, sorry but i'll be stuffed if i'm doing it to all 96 of them!

Cheers,
Ew