What are you machining?

[Jelly_Sheffield]

Not Dave Wilks by any chance?

He was the second guy I was thinking of, you posted just as I was finding his videos.

 

[oldbikedavey]

Mostly , today , it has been a bit of old chair leg being thinned down to produce a suitably narrow runner core and pouring bowl for the sand casting of aluminium in Petrobond ...
Could quite get fond of using that wood turning lathe.

 

[Brad93]

If you're doing similar sized jobs often enough to justify the time investment, it's fairly straightforward to make insertable trepanning tools inexpensively in-house.

There was a guy who goes to my local pub who recently retired from running a one man deep hole and trepanning shop, made all his own tooling from a particular style of carbide insert and heavy wall tube.

He did actually post some how-to videos before he retired, but I can't find them again right now.

The upshot was he would:

• get some tube of approximately the correct size,

• mill two or three flutes down the outside,

• let in a section to clamp indexable lathe tools with countersunk screws level with the top of the flutes (because it's cheaper to replace them if an insert breaks deep in a cut),

• then weld a cap on the back with a BSP 3/4 I tapped hole for coolant,

• weld a toolholder on, either a large square bar to clamp in the Toolpost, or an MT7 to fit the powered tailstock on a turret lathe,

• for really long jobs he had a additional fixed steadies on most of the lathes with the bearings at 90° to the normal orientation to support the tool whilst starting a cut.

I think the key information which I'm unable to remember is which insert geometry he'd found most reliable.

Most days he'd have 3-5 lathes running with automatic feed trips, slowly chomping away at big trepanning jobs, whilst he was doing finish boring ops on "the good lathe", making up new tooling, or doing office stuff...

The problem is time.

The company I'm working at twice a week the work is stacked up, i'm looking to buy sleeves in to save time.

 

[Jelly_Sheffield]

The problem is time.

The company I'm working at twice a week the work is stacked up, i'm looking to buy sleeves in to save time.

That makes sense, if there's a commercial product that's mass manufactured, it will probably be cheaper than putting you own time into it, as well as more efficient.

 

[Brad93]

That makes sense, if there's a commercial product that's mass manufactured, it will probably be cheaper than putting you own time into it, as well as more efficient.

Exactly.

It's time consuming drilling and boring big holes. We do have a Spade drill for the big semi cnc lathe but i haven't figured out any of the programming side yet

 

[Jelly_Sheffield]

Exactly.

It's time consuming drilling and boring big holes. We do have a Spade drill for the big semi cnc lathe but i haven't figured out any of the programming side yet

When you get to it, that probably will make something of a difference.

The BTA type (with carbide "cheeks" to register on the wall of the hole like a gun drill) in particular can give crazy fast MRR if there's enough power to support it, but the more recent designs of "conventional" spade drill aren't far behind now.

 

[minimutly]

When I worked in the machine shop one job was 6” diameter locking rings, 5 1/2” bore, acme thread, from 316 stainless. I used a trepanning tool, like a parting off tool but curved for clearance, and cut the centre out of each piece. They were maybe an inch thick and it cut okay.

First dozen or so I went halfway in from each side, but it was time consuming, so I tried a single cut straight through from one side, until I could feel it getting towards the end, compound slide would suddenly get easier to turn, and I’d back out before it came loose and locked up. Then I’d knock the centre out with a hammer. Then we had freebie chunks of 316 stainless for some other jobs.

One of the model engineering suppliers used to sell cast iron bar - 17ton iron I think it was called, some years ago mind. I can't remember the supplier though..

 

[Tigman]

Putting edge prep on weld test plates , clamping down with confidence with new set of clamps !

 

[Woody.v8]

Some handles for my cnc mill as it came with none.
This is part one as I'd like to put in some folding handles.

 

[Brad93]

Had a go on the vertical borer

 

[Maker]

Only after brazing the two pieces together did I realise the bore had closed up when I split it.

 

[fizzy]

Had a go on the vertical borer

Just because the borer is vertical doesn't mean the video has to be - does anyone know you turn your phone sideways to get fullscreen?

 

[Jelly_Sheffield]

Just because the borer is vertical doesn't mean the video has to be - does anyone know you turn your phone sideways to get fullscreen?

It is full-screen, just the other way up.

Even if you're not down with the kids enough to view on you phone, there's no excuse...

 

[fizzy]

It is full-screen, just the other way up.

Even if you're not down with the kids enough to view on you phone, there's no excuse...

View attachment 471351

Perhaps they should change all the cinemas and widescreen tvs

 

[Brad93]

Just because the borer is vertical doesn't mean the video has to be - does anyone know you turn your phone sideways to get fullscreen?

It's a youtube short fizzy it's designed to be watched on a phone vertical

 

[Hood]

Made some Alu parts and some acetal isolating top hats, did them on the CNC, a lot quicker than on the manual but would have been much better if I had a bar puller.

 

[fizzy]

It's a youtube short fizzy it's designed to be watched on a phone vertical

I guessed as much. Just like tiktok.
Ruins it on a laptop or desktop though.
You should do a longer video looks very interesting!

 

[Brad93]

I guessed as much. Just like tiktok.
Ruins it on a laptop or desktop though.
You should do a longer video looks very interesting!

There's loads on my channel

 

[Maker]

I guessed as much. Just like tiktok.
Ruins it on a laptop or desktop though.
You should do a longer video looks very interesting!

I use a Chrome extension to block them on my laptop, saves me getting tempted to click a stupid thumbnail.

 

[fizzy]

There's loads on my channel

Brilliant just been having a look. Loads of proper videos
I see you doing work on a js540. Mine will operate one way but then refuses to self feed the other. Turning the lever by hand doesn't work either but sometimes it does if you catch it right. Any ideas?