WALLER TABLE ENGINE
By Ramon Wilson
5 Eccentric straps
3. Cder

This time it is the eccentric straps, starting with a couple of pieces of brass - this is actually manganese bronze which machines well giving nice chips as opposed to spraying those razor sharp shards everywhere that you get off some brass.

The long edges and one face on each piece were milled then they were treated like the small bearings previously mentioned and soldered together in exactly the same fashion. (Size of this is 52 x 48 x 9 mm). The block was then milled flat on both sides before drilling and reaming a .250 dia aligning hole on the break line and four fixing holes.
It was then bolted to the small 'faceplate'. The spigot is aligning it in a central hole.
The rotary table was zeroed and the part set square to the mill the spigot now aligning the faceplate to the R/T.
The coordinates were checked by cutting in a couple of thou then the lower form was cut first. The R/T has stops fitted which makes for much less anxiety about over shooting.
The cut line was done to finished dimensions but the roughing out was done using a 3mm cutter with the finishing done with a 4mm.
Finished milling ops ready for the lathe.
First though a plug gauge was required. Made from a scrap of FCMS it was turned .01mm larger than the eccentric sheave diameter.
The bore was finish turned to just allow the gauge to push in easily.
After removal from the lathe, the top waste was cut away and trim the lower face with a file. This was then stood in the vice and the holes for the bolts and rod drilled and tapped before the lower waste was removed.
That plug gauge was converted into yet another expanding mandrel so that the surplus could be machined away.
And finally an eccentric - but it's not finished yet!
In order to simulate a cast finish first the corners are all well fettled. Using one of these engravers the surface is attacked - gently but with the engraver working on a 'heavy' setting at first.
And finally, after mounting on the mandrel and facing both running faces to finished width it's there.