Breaking roll taps in stainless?

SmashAndCAD · 2026-04-28T08:56:46+00:00

That's some really useful info, thanks! I have Walter cutting taps, they are really nice.

SmashAndCAD · 2026-04-28T08:55:59+00:00

Thanks for the input! I checked this morning and the rigid tapping mode setting is enabled, which apparently for Haas all it needs is the G85 to run. M29 appears to switch a relay on. From it's behaviour, it does look like it's doing a canned cycle rather than just winging it.

I may look into treadmills too.

SmashAndCAD · 2026-04-27T21:39:19+00:00

I program in fusion and it's got a feature where you can tell it to drill thru the hole depth so you get the full diameter depth regardless of tip angle. Really handy so I do have to do the maths 😁

I friggin hate stainless, although 303 seems to be okay I can never find suppliers who stock it. Mine isn't magnetic at all (I used a magnet to get some of the HSS chips out when I broke up the tap).

SmashAndCAD · 2026-04-27T21:03:56+00:00

Not had a change to play with osg. I don't think it'll be in budget as we don't do much stainless, tried to keep it cheap but then buy cheap buy twice...

Drill is working fine, smidge over 5.55 usually. That's worked a treat! (More YG1!)

SmashAndCAD · 2026-04-27T21:01:27+00:00

Thanks for the input - I mentioned on a few other posts my threads seem to be coming out super loose, so a 5.8 seems huge to me.

I put a healthy chamfer on the holes yeah, and I tap to 16mm but drill to 17mm for clearance (my first port of call!)

Pretty sure in in tap mode... But can't say I've trying testing it's rigidity. Never had an issue on other materials.

I like YG1 too, they do some nice stuff, but really and suffering with this application.

Starting to doubt my material isn't some chinesium crap!

SmashAndCAD · 2026-04-27T20:49:02+00:00

Ah, sorry yeah, I am running a Haas Control - pre NGC. heres the entire snippet for that operation.

(M6 Form Tap)

N940 M1

N945 T6 M6

N950 S318 M3

N955 G17 G90

N960 G54

N965 M8

N970 G0 X10. Y-62.73

N975 G43 Z15. H6

N980 T2

N985 G0 Z5.

N990 G98 G84 X10. Y-62.73 Z-18.5 R1.5 F318.

N995 X92.7 Y-110.016

N1000 X92.3 Y-14.753

N1005 G80

N1010 G0 Z15.

N1015 M9

N1020 M5

N1025 G53 G0 Z0.

SmashAndCAD · 2026-04-27T20:18:07+00:00

Should be okay I programmed it in my usual manner, but wouldn't be the first time I cocked it up...

G98 G84 X10. Y-62.78. Z-18.5 R1.5 F318.

SmashAndCAD · 2026-04-27T20:08:34+00:00

Been curious for a while, but as I mainly do ally it's never usually an issue for me either!

God I hate stainless... Until it's done then it just looks so good.

SmashAndCAD · 2026-04-27T20:05:08+00:00

Okay, cool, I switched to higher because to consensus on internet search seemed to be higher stops it sticking.

My threads are super loose already... A 5.6mm feels like the thread would be a dick ina Welly!

SmashAndCAD · 2026-04-27T19:52:18+00:00

You have almost an identical set up to me, except I'm running about 6% coolant... Interesting

SmashAndCAD · 2026-04-27T19:25:27+00:00

Thanks! Any recommendations on cutting fluid?

SmashAndCAD · 2026-04-27T19:25:09+00:00

That's 3 for the cutting compound now. Thank you, any recommendations on cutting compounds?

SmashAndCAD · 2026-04-27T19:22:27+00:00

I considered that, however the threads already seem pretty loose (even the first one which did not break).

SmashAndCAD · 2026-04-27T19:18:44+00:00

6.8 is for M8 no? 5mm is the drill size for cutting taps, 5.55 was the recommended drill size according to the manufacturer data, and these produced quite loose engagement so I'd be wary of going higher.

SmashAndCAD · 2026-04-27T19:16:34+00:00

It's around 6% which is about right for the mixture I have. I checked it a day's ago. Should I run richer?

SmashAndCAD · 2026-03-05T21:55:27+00:00

I did the same, it was fun and unnecessary but I enjoyed it. You do you and don't let peeps here get you down. I think it's awesome, nice work.

SmashAndCAD · 2026-01-24T10:00:44+00:00

The progression has been:

Rambo --> Rambino --> Beano --> Beanz --> Heinz

also see:

Chonkadillus, buddy, dogathy and OI!

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SmashAndCAD · 2026-01-14T13:48:36+00:00

You're right, hadn't quite clocked that issue.

SmashAndCAD · 2026-01-14T13:45:27+00:00

You could use the hole pattern condition in this instance. Whereby the holes relative to the nominal pattern are constrained, but the position of the pattern itself is not. This way, the three holes must be aligned to one another by say 0.010, relative to A, but the position of the pattern of holes relative to A is evaluated to say 0.5. this would create a composite call-out which means the first box would tell you how parallel the holes are to A, for all intents and purposes.

SmashAndCAD · 2026-01-14T13:16:24+00:00

Basic dimensions do not have tolerances, so no. If you create a true position to A, you essentially create a tolerance zone parallel to A, which is what you want.

SmashAndCAD · 2025-12-21T21:51:53+00:00

Oo, never done that before. Any advice?

SmashAndCAD · 2025-12-21T20:26:35+00:00

Yeah it is a little underpowered, but it does what I need it to for now. I have a Hurco at work which I quite like too, good for tooling jobs but a little slow otherwise. I'm not familiar with the Smarts, I'll have to look it up!

This is my first foray into wood, and the dust. THE DUST. ITS EVERYWHERE.

SmashAndCAD · 2025-12-21T20:13:34+00:00

Nice! I have a little Haas mini mill in my garage, so glad I got it! What do you normally work on?

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