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Which is apparently also 5160 by ASTM or 5155/5160 by AISI / SAE ... damn non-standard standards...
https://equivalentmaterials.com/materials/din-55cr3

This mob (and several other aftermarket manufacturers) say spring steel (5160) https://www.superproeurope.com/anti.roll.bars.cfm

Various other internet sources list 4340, 4130, 4140 and EN45 as...

I don't know how the app does its calculations, I assume it's just working off shear strength of the material, not accounting for tool geometry and probably a bunch of other things. I mainly use it...

That was 75mm, but I just put in a few numbers from 30-150 and the difference is negligible (less than 0.2HP) as long as you adjust the spindle speed to suit.

Surface speed 148 m/min, so 630 rpm @...

Just for fun I got the FSWizard app out... 4mm depth, 0.2mm feed in 4140 comes to 6.5HP estimated power draw.

I would suggest brass. Aluminium will lose heat quickly and so will be harder to keep at a stable temperature; commercial branding irons are brass for a reason.


Stupid question... Why can't you...

Reduce the depth to 2-3mm, it doesn't need to be milled out to 6mm for what you're doing. Back when I was making furniture, we had some branding irons made up in solid brass with MUCH finer detail...

I know it's nice to be able to make tools yourself, but I firmly believe that the age of using HSS for general machining has long gone. If you were boring small holes that need expensive fancy...

No such thing, just might not be cost effective ;)

Maybe they're just selling the photos of the lathe? :p

Our Schaublin is just a leadscrew with a half nut that works the usual way, but a high helix ballscrew can be driven by just sliding the nut along it with no issue, even with the motor connected...

But then you lose all feel for what the tool is doing.I use our CNC Cyclematic in manual mode (boring out soft jaws, making test cuts for tool setting, etc.) and it's a very weird feeling that I...

The handwheel is rack and pinion. Our Schaublin 125 at work has a similar electronic feed system (no CNC threading though) and it uses a single normal leadscrew for both threading and feeding.

Is...

Didn't know anyone else was doing Hardinge clones

Any particular reason you want that specific machine? I'm assuming it's the fancy CNC leadscrew

Good point and expensive machines have expensive spares...

This mob bring them in already, might be worth comparing their landed price to the ex. Taiwan price and seeing if it's worth the hassle of arranging everything yourself...

That was true a decade ago, not any more. Mirka made a sub-1kg 350W sander (hands down the best sander I have ever used and, IMO, the best electric ROS ever made), it's discontinued but the...

Can you get it apart for a measurement? If you can get the throat diameter we can work out the pitch and you might be able to find and modify a stock gear or have one made

I found some 90:1 worm...

The rule at work is TiN is good on all materials EXCEPT aluminium; ally sticks to TiN, uncoated is better.

For OP, download the FSWizard app; it has all the info you need on feed/speed and a whole...

Quantum mechanics aside (because there's maybe a few hundred people on earth who could get into the details of electron behaviour and I'm definitely not one of them), it basically comes down to how...

Way above my pay grade, but...something something quantum mechanics :rolleyes: Also face centred cube vs. body centred cube.
https://www.scientificamerican.com/article/why-dont-magnets-work-on/
...

That's a serious looking chair, don't forget the red one goes faster :p

Did a quick google for metal recyclers, they don't all make it obvious but some do clearly state that they supply both local and overseas mills.

Cos when they remelt it I'd assume that it all goes in and they start from scratch. It's not worth their time and money to test, sort and store 20 different types of swarf.

1020, 4140, EN36A, we...

The Mk 1 Colchester Bantam (late '60s) at work has a cutoff switch on the gear cover from the factory and being from a school I'd expect there to be one as a legal requirement.

What's this bit?
...

Just throwing ideas out...I see there's an interlock switch for the chuck guard, is there also one for the gear train cover that won't let it run when it's not fixed in place?

I thought country of origin was mandatory on packaging...

As far as I know, your options for milling are spiral endmills (cheap to buy, hard to sharpen) or carbide insert tools (easy to sharpen, comparatively expensive)


Trade school was using endmills...

I don't think they will move entirely to China, at least not in the short term. They bought Carbitool a few years ago (and haven't just absorbed it and shut it down), so that indicates to me that...

According to this mob they're made here (I believe the factory is in Melbourne) https://www.revolutionindustrial.com.au/sutton-tools-viper-25-piece-metric-drill-set-m2-hs
According to the Sutton...

Not gonna happen unless you have 3-phase.

Perhaps these would give some of the damping benefits without having to dig in a foot of concrete...

Nice piece of gear, we have 2 of their lathes at work (a 70 and a 125) and they're sooooo smooth to use.

Just use a No 2 or 3 centre drill. Drills are for drilling, mills are for milling

That's what I was thinking; turn the OD but leave it attached to the bar, hold it in a collet block to mill everything, then part off.

Thought I'd look up pickling gel/paste....nitric acid AND hydroflouric acid :oo:

Full hazmat suit, gas mask, decontamination...definitely pass on that one

I'd say that's the theory.

You're probably not going to be using the full travel all the time, so I would adjust them to suit the range of movement that you use regularly and just back them off a...

Yep, there's good a reason why they make carbide parting inserts that shape :2tsup:

The full tooth depth is always 2.25 x Mod, regardless of pressure angle, for a true involute gear.

The 2.157 number is for the "composite" system, which is an involute curve around the pitch line,...

Correct. They make life easier because A) you just touch off and go to the theoretical thread depth instead of having to work out the extra for the root radius, and B) they round over the tops of the...

All stainless WILL rust eventually without some form of protective treatment due the presence of "free iron" on the surface. We make several stainless components at work that need to withstand marine...

Not in our shop, I suspect the response would be "What do we need one of those for when we have 5 bench grinders?" Or something to that effect but less polite :p
With CNCs running carbide, there's...

And it's just a good skill to have

The biggest problem I see here is that as the tooth count decreases, the difference in tooth profile from inside to outside increases; on a 60 tooth gear, you're only spanning 6 degrees and can kinda...

Of course not, they've been so successful until now :doh:

Hope you can get it sorted out with minimal pain

You only need a comparison sample for absolute measurement (how hard is it), for comparative measurement (which one is harder) you'll see straight away. An automatic centre punch might give an...

If you know it's one of two dissimilar materials (from what I can gather from the internet, Double Griffin is tool steel and Durax is just 1040), a simple hardness test might be enough. Or you could...

The equations are here, starting about halfway down https://khkgears.net/new/gear_knowledge/gear_technical_reference/calculation_gear_dimensions.html
Basically, module = pitch diameter / number of...

The world's most accurate dining table? :p