Finally I have finished off the slitting saw arbor I have been making. This is designed to hold saws with a 16mm mounting hole.
Some points of interest, well perhaps of interest. :-)
- All material is 1215 free cutting steel using 25mm, 12mm and 6mm sized round bar as source material
- Threads are M10x1 with external threads cut single-point on lathe and internals done with a tap
- Arbor fits a 20mm ER collet ( I'm using ER32)
- The pins on the locking key are salvaged from a printer and are 3mm diameter
- The locking key is made of three parts with the head and shaft M10x1 threaded and secured with loctite
I think that's probably the main items. On to the long list of pics :-D
A render from the CAD model.
Starting to shape out the arbor, reasonably pleased with the finish from the Diamond tool holder and its crobolt bit
The hole for the shoulder screw is drilled and bored out as accurately as I can managed it. Test fits and checks with telecopic guages show its within within 0.02 of 16mm.
You can see from this that I have rechucked the part after turning. Since my 3 jaw is mounted to 3 bolt secured registered plate (like many smaller lathes) I lossened the bolts a little and using a DTI and some careful tapping got the runout of the rechucked part down to ~0.02mm. I used the machined area past the chamfer transition as the register point as it will be concentric with the arbour since it was turned at the same time.
The arbour and retaining shoulder screw done as far as the basic turning is concerned. Still need to drill holes for the pin key/wrench.
Next is the locking key/wrench. I debated with myself quite a bit on this. Initial plan was to do a wrench/spanner style model like what you see with the pin wrench that comes with an angle grinder. However the more I thought about that idea an the potential for slipping with your hand in line with the edge of a slitting saw blade the less I liked it. So I ended up going with the key that comes in end on. The next series of photos will show what I mean.
The shaft and the pins for the locking key.
The shaft and head secured togther. I dont have any pics of the head being turned. But nothing special. 25mm round, turned to 24mm, angle on compound set to 23 degs and used to turn the taper. Then the thread for shaft drilled and tapped.
The pins setting in the head. Using the shoulder screw from the arbor to keep things aligned while the inital setting period (20 mins) passes.
The grand finale picture. The arbor with a saw in it and the locking key all finished.
Hopefully of interest to some people.
Cheers,
James.