What are you machining?

[Kram]

Got a nice DTI arrive in the post. Broke the soldered shim on my indcator holder. New brass screw, with end turned 60 degrees.

 

[lchris21]

some switchgear for my bike build...

 

[mtt.tr]

some switchgear for my bike build...
View attachment 199838 View attachment 199839 View attachment 199840

Smart
Now you need in bar cables

 

[lchris21]

Smart
Now you need in bar cables

thats what the slot in the side is for

 

[Kram]

That saying, "Dont put your fingers where you wouldnt put your dick". Well applies to face too. Leaning into the gap behind to fit chip guard and a ccmt tool twatted me in the lip.

First chips in ages. Boring out a 3" lump to be spindle pulley/hub for the 110mm and 180mm pulleys.

 

[roofman]

Going on from your wanted thread...can i ask what are you making of fixing with stepped pullys?

 

[eLuSiVeMiTe]

Going on from your wanted thread...can i ask what are you making of fixing with stepped pullys?

Lathe. New motor and pulleys.
https://www.mig-welding.co.uk/forum/threads/new-motor-and-vfd.95777/page-2#post-1444458

 

[Kram]

Rough atttempt at a pulley. Started cutting right side angle by compound and the rest is rough.

Problem being, without a tool angled under 38? degrees, wont have clearance enough to sweep the bottom. Should I start with a square groove tool to full depth, and then cut the angles, until they intersect?

 

[ronan]

Rough atttempt at a pulley. Started cutting right side angle by compound and the rest is rough.

Problem being, without a tool angled under 38? degrees, wont have clearance enough to sweep the bottom. Should I start with a square groove tool to full depth, and then cut the angles, until they intersect?

Yes, i always plunge with a parting off tool, get the bulk of the material out of the way and give yourself a bit of room to work.

 

[Hood]

I would grind up an HSS form tool for that. Same profile on both sides as the pulley groove but narrower.

 

[mtt.tr]

Have 4 poly bushes to make, not the most pleasing material but its do able.

First job was to make an arbor and clamp its against the Chuck jaws, its damn grippy.

 

[mtt.tr]

Just to make some stainless sleeves and its done. Hopefully Only an hour left

 

[slim_boy_fat]

Just to make some stainless sleeves and its done. Hopefully Only an hour left

You going to knit a jumper? .

 

[mtt.tr]

You going to knit a jumper? .

Horrible bloody stuff.

 

[Hood]

Horrible bloody stuff.

I have only ever machined it once and thought it was quite nice to machine, maybe a different grade or something. I used a DNMG insert but it was actually a HSS insert, polished and very sharp with a positive rake.

 

[Ton-up]

Easy to machine if you slice it rather than turn it.

 

[mtt.tr]

I have only ever machined it once and thought it was quite nice to machine, maybe a different grade or something. I used a DNMG insert but it was actually a HSS insert, polished and very sharp with a positive rake.

If im honest this stuff was pretty easy, just ground a hss blank very positive rake finsh was good. I have machined softer poly and that really is awful as it just doesn't want to come away.

I also find deep depth of cut high speed infeed and fast spindle speed using stabbing moves forces the poly to break away from it self, continuous cuts it get pushed along in a complete ring

Oh and wood spade drills are the nuts for drilling it


Its more akin to wood turning.

 

[Kram]

Pulley done, other than the keyway.

Too big

1:1.

 

[ronan]

You can do the keyway on the lathe too if you don't have broaches and a press. Using the carriage like a shaper.

 

[Maker]

You can do the keyway on the lathe too if you don't have broaches and a press. Using the carriage like a shaper.

I've tried that once, I found it worked much better using the more rigid rear toolpost, tightening the gibs on the compound would have probably helped too.