Rotary table build

[Pete49]

Well as my beam engine is an hold due to a few problems I decided to start on a rotary table as done by deano and also built & catalogued by Arnoldb. The pics show where I'm at for now as I'm going to get a piece of steel for the table Monday (I hope)
Pete

[steamer]

Oh I'll tag along for that!

Dave

[RMO]

Count me in for the ride as well.

Mike O

[zeeprogrammer]

I'll be watching too.

[Don1966]

Hey count me in on this ride. Should be some interesting project.

Don

[Pete49]

OK a bit more done today. I didn't take pics of the tapping of the holes for the shaft but I guess you all know how that goes. Also opened out the hole for the bearing in the base. That pretty much was my days work. More to come tomorrow . My next real hurdle will be finding a worm and gear to suit as I'm not confident in that dept.  I will see if I can buy something close for this job as I don't want to stuff it all up.
Pete

[arnoldb]

Good going Pete 

If you don't want to try to make your own worm and gear, look for a set with either a 60:1 ratio or 72:1 ratio that will fit.  A 90:1 ratio would also work, but from what you've shown so far, a 90:1 combination might be too big to fit (or have very fine teeth, which can make things difficult with alignment and spacing)  Other numbers can be awkward to calibrate.  I'm really pleased with the 72:1 ratio I went for; that gives 5^o per turn of the handwheel and makes things easy to mentally calculate while using the table.

Kind regards, Arnold

[Pete49]

Thanks for the tip Arnold, I'll look around to see what I can scrounge up. The overall size of the base is 4 inches, 0.375 thick walls so about 3.250 internal. I won't show the welds as its been a while since I had to stick weld but the mig is out of gas and it shows
Pete

[tel]

I might have something here - got a drawer full of salvaged gears, failing that we can always cut one.

Sneaky Tip #2473: For one job I did some time back, I used the worm out of a cheap shifting spanner - fitted a 20dp gear to a tee!

[swilliams]

This will be fun Pete, I'm in

Steve

[tel]

Got a surplus 60t Mod1 here Pete - yours if you want it.

[Pete49]

Thanks for the offer Tell but its too big . Largest I can use is 45mm diam. Just scrounged around and found 2 nice worm gears from a photocopier plus a 30,34,41 and 50 tooth gears which except for the 41 tooth (steel) are nylon. I have a 36 & 60 tooth in my change gear set and I have a dividing head compliments of Harold Hall   . Just need to try and make a cutter to do the job. (more research). I figure that 36 being half of 72 may work OK and failing that I can make a 60 tooth (I hope) More suggestion eagerly sought.
Pete
ps pics to follow

[tel]

60t @ 40dp would give you 39.7mm od - I have a cutter for that if you get stuck. Might even have a bit of CI for the blank.

[Pete49]

Having weighed up my options rather than anchors  and realised the the base should have been larger so as to accommodate the right sized gears so Tel, the spare 60 would be nice. I figured the best (and cheapest) would be to remake the base as I have sufficient materials for that and it would allow me to use available resources. Its only a small hiccup but another piece of the learning curve. Part of the problem was my conversion of imperial measurement to metric for purchasing and manage to make 100mm into 5 inches instead of 120mm. Just another case of seniors moment
Pete

[tel]

  'appens all the time! PM me your address and I'll get it away to you in the next few days.

And just to keep you on track, here's one I prepared earlier! Sold it off a few years ago and have regretted it ever since.