What are you machining?

[Kram]

Could use some ideas Stood infront of lathe for an hour tidying as couldnt think of anything to turn.
Want to use and test the new boring bars/test inserts.

 

[Hood]

What about a hole?

 

[Kram]

Yes, but it needs a purpose! Otherwise I'll just have a load of offcut bars with holes in each end, and I have enough of those already

 

[Kram]

A hole in some en3b mild, horrible stuff! Just testing boring bars and inserts...

Chopped a 32.m bar of stainless into usable lengths so will try that later.

 

[Wedg1e]

RichieW, climb-milling with that bar stuck out the side of the vice that far...
I should imagine it rattled like the bones of a Stockton crack-hooker.

I keep meaning to make some T-nuts for my ancient Perrin drill; I keep on monkeying it with an assortment of lengths of studding and whatever nuts will slide into the grooves

 

[Agroshield]

...a Stockton crack-hooker.

I keep meaning to make some T-nuts...

Are they the ones who come around to your place and dig the weeds out of the gaps in the crazy paving with a bent implement?

Lazy T-nuts can be made from Unistrut zebedees. Easy to size with a belt sander.

 

[dobbslc]

Some serious work needed doing today so I fired up the South Bend lathe.
The locating pin on the bog roll holder has snapped off causing the roll to fall out at the worse possible time.


I chucked it up, it took ages to get dialed in, I don't want too much run out due to the high speed it'll have to work at on the morning after the night before...
Bored out the center and faced it off.
I used a piece of aloominum to make a new pin.

Parted it off but the tool was miles below center and I couldn't get it adjusted correctly so just left the parting tool cam above the locking clamp. I'll need to sort this out later.

Piece turned and inserted into the bog roll holder and fixed with some UHU, I love the smell of UHU!



I presented this to my wife and she seemed quite pleased
It will be replaced when the bathroom eventually gets refurbed but just has to last a bit longer.

 

[dobbslc]

I don't know why there's two extra pics at the end, maybe I sniffed to much glue

 

[MattF]

causing the roll to fall out at the worse possible time.

 

[Woody.v8]

If it works it works

 

[Tigman]

A little advice please I'm roughing out a bit of aluminium , it's an extention for an exercise bike saddle , I set the head of the mill to 9 degrees and am using a fly cutter to get it down to size , question is why does the fly cutter cut twice , hence the circle on the piece , it doesnt make sense to me , even on a very fine feed I won't get a finish , any ideas m

 

[Dr.Al]

Presumably means your head isn't perfectly trammed in the other plane (left-to-right tilt)

 

[Tigman]

I can see that , but surely the cutter would be lower one side so only cut once ?

 

[Scalarocco]

I can see that , but surely the cutter would be lower one side so only cut once ?

If you feed from the low side first, yes. If it does it both ways then something is loose.

 

[Tigman]

Yeah I see what your saying , I will have a look at the head tomorrow

 

[Tigman]

Thanks for that , driving me mad

 

[Dr.Al]

If you feed from the low side first, yes. If it does it both ways then something is loose.

What he said.

However, it's also worth noting that with a fly cutter with a reasonably amount of stick-out and a relatively slim diameter cutter, there may be a (very) little bit of flex in the bit. That could result in it taking what is effectively a spring pass on the second edge, even if your head is perfectly trammed. If that's the case then to get rid of it completely you'd have to deliberately tilt the head (by a fraction of a degree) to lift the trailing edge slightly.

 

[minimutly]

What he said.

However, it's also worth noting that with a fly cutter with a reasonably amount of stick-out and a relatively slim diameter cutter, there may be a (very) little bit of flex in the bit. That could result in it taking what is effectively a spring pass on the second edge, even if your head is perfectly trammed. If that's the case then to get rid of it completely you'd have to deliberately tilt the head (by a fraction of a degree) to lift the trailing edge slightly.

Aand, as @Scalarocco alluded to - something loose - that could be the quill bearing, allowing a few thou of quill float. Easy to check, dti vertically up underneath it, and use a suitable knee and lever to try to apply some lift.

 

[Kram]

Unless your intending a rough finish I'd also suggest a much more rounded tip tool. Thats a very sharp pointy one and you'd need to feed extremely slow to avoid lines.

I had great results with the cheap 50mm facemills and alu inserts.

 

[Tigman]

I will try that , hopefully not the case !