Lewis_RX8
Member
- Messages
- 1,571
- Location
- Scotland
Had some more sucsessful go at thread cutting today , Well at first it was a few TPI off what I selected on the table which seemed odd but I had in the 42 tooth gear which is designed for cutting special threads in a second table at the bottom I had to change to the standard 36 tooth gear so I could cut the majority of the threads including this which was a 5/8 UNF 18TPI
Zeus book I asked for at Christmas was very handy for thread depths and getting the right sizes without messing about on google for ages can see why they occupy a lot of top pockets in overalls
Picked out right tip and scratch pass was when I noticed the gearing problem , That was then sorted and checked against a 18TPI gauge and confirmed it so started cutting away. It is far easier to cut threads in imperial as the dial can be used so no messing about in reverse thankfully. Not tried the black magic Rapid screw cutting gearbox but I will at some point. Thought best to learn the basic method first without cheating and I am in hurry.
Threads fit well and happy with the part , Was a fitting for air comp line
Also had a go at the tailstock alignment , Would appreciate @fizzy chiming in on how he sorted his which I believe was also 12 thou too low.
The turning centre was speaking weird and would not clamp in properly so i got it in close by turning a taper in the lathe then adjusting to as close as I could by eye
Then tried a test bar but don't think I am quite right here , Tailstock was engaged well enough it was hard to spin the work piece and the turning centre separately they wanted to spin together.
However 2" bar may be too big to try and measure how the tailstock is deflecting it too one side however all I can find in the right length at the moment.
Was showing 0.02mm out which doesn't seem much going off by me aligning it by eye hence me being skepital about the measurements but It will do for now I am sure.
Zeus book I asked for at Christmas was very handy for thread depths and getting the right sizes without messing about on google for ages can see why they occupy a lot of top pockets in overalls
Picked out right tip and scratch pass was when I noticed the gearing problem , That was then sorted and checked against a 18TPI gauge and confirmed it so started cutting away. It is far easier to cut threads in imperial as the dial can be used so no messing about in reverse thankfully. Not tried the black magic Rapid screw cutting gearbox but I will at some point. Thought best to learn the basic method first without cheating and I am in hurry.
Threads fit well and happy with the part , Was a fitting for air comp line
Also had a go at the tailstock alignment , Would appreciate @fizzy chiming in on how he sorted his which I believe was also 12 thou too low.
The turning centre was speaking weird and would not clamp in properly so i got it in close by turning a taper in the lathe then adjusting to as close as I could by eye
Then tried a test bar but don't think I am quite right here , Tailstock was engaged well enough it was hard to spin the work piece and the turning centre separately they wanted to spin together.
However 2" bar may be too big to try and measure how the tailstock is deflecting it too one side however all I can find in the right length at the moment.
Was showing 0.02mm out which doesn't seem much going off by me aligning it by eye hence me being skepital about the measurements but It will do for now I am sure.
They are radiused. The chamfer fool me. Goes to show that's how they are produced. That's probably why the Chinese chucks are full of grit and need flushing out? My old chucks were so knackered that I presumed that has how they got a radius. However this a relatively new chuck.
