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Looking great! Almost time to cut the flexure.

Is there a particular diameter for the foot on the moving part? I assume that for checking a scraped surface it needs to be large enough that it...

Dial indicators are much easier to use than digital when checking for variation like when setting up a workpiece in the chuck. I don’t actually own any digital indicators but have used them in the...

Angle as in rotating the tool post about its vertical axis.

I considered that maybe you’d reversed the direction of spindle rotation to just burnish the surface but thought the amount of material...

Only other variables I can think of are tool height and angle.

Steve

Feeding in the opposite direction or lube/coolant?

Steve

I know you asked specifically about a machine recommendation, but I think you might be jumping ahead a bit far at this point.

Roughly what size is the biggest panel you’d need to cut?
EDIT: I...

Wow - that’s like looking through a museum.

Steve

Don’t get too hung up on the holders and inserts - you’ve got more than a good enough variety there to get you started.
You definitely don’t need a QCTP holder for every tool (but if that’s what...

Sure thing. Just ordered some in the stainless carbide flavour.

Steve

Are all the tool holders for TN** inserts?
The N is negative rake. Nothing wrong with that and you generally get double sided inserts meaning more cutting edges/points per insert and they are...

Finally pulled my finger out and ordered a new pair of the iGaging calipers while they were on sale.
They arrived today - amazing how clean and clear the display is, and how tight they feel compared...

I’ve been buying my zirconia linishing belts online from Smith and Arrow.
Seem to last well and no breakages etc.

Steve

J&H - I have to agree about the battery cover and seal on the iGaging. They’re definitely a bit average, but it hasn’t got worse over time or actually caused any other issues on mine.
I only have...

I doubt you’ll notice any difference between them.
Assuming you’re running the rod horizontally the easiest way to increase stiffness would be to slide a bit of tube over them.

Steve

Mate of mine has a plasma with inbuilt compressor that he bought about 10 years ago. Not sure what brand.
I didn’t come across any when I was looking for a cutter myself, but I see that weldclass...

I’m still using the Eutectic 680’s I was given in 1991. In fact I used some on the weekend to weld an axle flange on the old Landrover ute. The previous repair using the same rods lasted 10 years!!...

Hafco have some push on/push off switches that might be able to be adapted

https://www.machineryhouse.com.au/spare-parts-switches

Steve

Always good to meet other forum members in person and glad they’ve gone to a good home.

Happy welding!!

Steve

Here’s the old torch set that’s soon heading to its new home.
It’s “Elga”brand. It was already relatively old when I bought it in 1985, and was still working fine when I last used it around 2004 :)...

I guess the term "ownership" gets a bit technical - but there's clearly "rental" and "perpetual once off up front payment for the bottle". As you say - some mixed arrangements with that once-off cost...

I see you’re in Melbourne, so good chance there is a dedicated welding supply place nearby that will let you handle the gear.
BOC, Migomag, Migwell as well as plenty of independent welding and...

I did a lot of oxy-acet welding as a young bloke. Just hobby stuff, never welded as a trade.
I no longer have oxy-acet gear as I simply don't see a need for it. I have oxy-lpg for cutting thicker...

I’m NOT a sparky so can’t give a specific regulation reference, but definitely not kosher in my experience.
It’s a sub board, should be on its own circuit and the 6mm feed to the shed doesn’t...

A decent face mill would make short work of the bulk material removal.

Steve

A thou along the top and basically nothing along the front face - I'd be over the moon about that!!
Sort out the tailstock height and start making chips I'd think.

Steve

Trailer axles come up frequently on Facebook marketplace etc too.

Forklift tynes are a great source of high quality non-round steel. Pretty sure they are 4140 or similar. Machines beautifully but...

I realise you were asking specifically about new steel, but if you want to save a few dollars for smaller diameter stock then keep an eye out for high tensile bolts
IME they are nice steel to work...

Easy!!
Slightly too aggressive on the feed/DOC and ping - it just happens :)

Practically though, there’s probably only the same cross section of material as a 4mm solid endmill - so I’ll cite...

Just for interest, no material left in the center a 2 insert 14mm diameter BAP300 tool holder once the pockets are cut.

Here’s one I broke recently. Something to keep in mind when looking at...

Good info Karl.

My own observation is that the recognised brand manufacturers don't typically run the generic (eg APxx) inserts for milling. I've come across a couple of exceptions, but in...

Thanks Karl - that pretty much confirms what I thought ie that the cheap ones are crap but a good one will work well.
IME there is no way known you’ll get that sort of performance out of the eBay...

What I meant by "agricultural" was the possible applications in my workshop compared to the higher precision surfaces I understood the stones were originally intended for (like his beautiful vee...

I was pretty sure there had been discussion here previously about them.
Finally found the thread - started by JHovel back in 2017 when he made some of his own.
...

I agree Michael, but I think we’re both considering applications that are magnitudes more agricultural than they are actually intended for.

FWIW - here’s the Robyn Renzetti video I referred to...

My understanding of the purpose of grinding them is to actually grind the tops of the grit flat, so that they won't cut like a normal stone (and hence won't actually cut the primary surface).
...

Back in my youth we used the old nichrome wire wound radiant heater elements as rheostats for charging motorbike batteries from dumb car battery chargers. Normally to use as spotlighting batteries. ...

I have tried that a few times in the past, but TBH what normally happens is I get bored watching it, get distracted with something else, forget about it, go inside, then remember in the middle of the...

Thanks John.

I generally agree with what you're saying in regards to testing start/cranking batteries.
I don't see that it applies directly to deep cycle batteries though, where its capacity...

I seem to accumulate a few 12v batteries around the place.
Cranking batteries, deep cycle ones, traditional wet lead-acid, AGM, VRLA etc and ranging from small 6Ah ones through to about 150Ah. I...

I'm definitely not a fan of them. I find them harsh and noisy, and not very effective for steel. Mill is a 1.8T TOS FNGJ32 so rigidity isn't particularly an issue.
Possibly its the cheap crap...

Not my tip - I learned this from Joe Pie on Youtube a few years ago. I've had to use it a couple of times lately so thought I'd share in case anyone doesn't know about it.
Here's the original video:...

I read your original post saying you unscrew it to put on your rotary table - but didn’t click that you were unscrewing it from the stub.
I was actually wondering how you were mounting it on the...

Just a quick update...

My can of CRC 3-36 arrived the other day, so I've given the T&C grinder a spray.
Weird stuff - looks like any other thin oily spray when it goes on, but come back the next...

I think your original reasoning was somewhat sound, but possibly some mixed/invalid references.

I haven’t looked at how you might have got the initial thread depth, but referring to this page...

I typically just use diameter minus pitch to get the ID.
In this case for 30mm x 24TPI, it’s about 1.05mm pitch - so bore the ID 28.95.

Steve

Sometimes trying to tighten a screw can get you enough movement to break it loose.
Another tip is to use a smear of valve grinding paste on the bit. It provides some additional friction -...

From what I can find online the minimum radius for internal corners is typically about 0.75mm.
I know there’s also a general rule that the minimum hole diameter is 1x the material thickness. Not...

You can definitely work around the internal corner radius issue depending on which faces/features are critical

Here’s a quick sketch of a couple of example options for internal radii.
From left...

What thickness material?
I’m assuming under about 20mm as that’s about the practical limit of laser IME…

Steve

Nice find Elan. That’s a simple and very useful calculator.
I got just over 1000psi from a quick calc using 28,29.5 diameters and the default 350/500 MPa strengths for steel (conservative since the...