Started with a piece of 32mm sq x 80mm lg hot rolled mild steel
Cleaned up all around,machined to fit my std 4 way tool post
and machined the 2 knurlwheel faces at 40o rather than 45o
to try achieve more of a diamond pattern.Cant seem to notice any difference
and the orig at 45o seemed to cut better.Tested various materials from
1/2"brass,16mm dia mild steel,32 mm alum to 50mm dia tough steel shafting
with varios feeds,speeds and depth of cut.In general I would note the following-
the fine knurls 0.5p are only good for small dias.Good results on brass ,alum.
The medium knurls were best for all round use but the coarse knurls were OK forlarger diameters and aluminium.Lathe speeds were in general between
100 and 250 rpm. Fine feeds were used throughout but hand feed was ok for light cuts.
In general knurl depth was 25 to 35 thou dependant on matl,diameter and knurl pitch and took a full depth of cut on steel of 30 thou as well as up to
4 passes at 10 thou each to total depth of 40 thou.Multiple passes were easier
on the tool and lathe and each pass picked up with the previose with overriding on the cut knurl.AT THIS STAGE I AM VERY PLEASED WITH THE RESULTS and would recommend it to anybody over the scissor crush knurlers
Conclusion.The tool is easy to set up but must be on centre height,although I
machined to size and shimmed slightly just touching the workpiece until both wheels revolve confirms height.However a QCTP would be ideal for ease of setting,and if going that way then rather than make a tool to mount in the toolpost I would look at making a dedicated toolholder with the wheels mounted on to just slot into the QCTP. This is the way I will be going next
Keep this thread open