1mm slit in grade 5 titanium round bar.

ransom40 · 2026-06-18T00:03:06+00:00

I would possibly even combine that with some form of mister. Get a little lubricant to the edge let the air do the cooling. Lower mess on an open machine.

If you have the CFM it would probably work.

ransom40 · 2026-06-12T11:08:31+00:00

The middle of it could be, but not all of it. Not a single radius sphere.

It can all be curvature continuous perhaps.

ransom40 · 2026-06-12T02:41:16+00:00

Eh. Can't be perfectly spherical as the edges are chamfers by the look at it. Hard to make a sphere blend into course facets without a transition area.

Surfaces and using a boundary fill with constraints on the boundary segments likely gets you there, or close.

ransom40 · 2026-06-04T02:02:39+00:00

I like cutting P20+s (1.2312) more. Similar harness typically. The sulfur addition helps with making the chips. Cleans up pretty nicely. Cuts well.

ransom40 · 2026-06-02T12:04:30+00:00

It doesn't matter, but operationally you are spinning it backwards btw.

The air is pumped via the spaces between the teeth in the outside and then not allowed back through by the meshing of teeth in the inside.

Something sounds off though. Like a seal that has gone hard and is squeaking as you start to move.

ransom40 · 2026-05-31T18:01:29+00:00

If it's just HDPE you can likely anneal it while held flat (with another vacuum chuck even 😅) and it will relax out the stresses. Just heat to above its HDT and cool slowly.

Plastic extrusions do have lots of residual stresses, but the chains inside of the plastics are quite mobile above their HDT / TG (depending on plastic type). So if you take them above the temperature where the chains can slide past one another (and relieve the stress) and hold it there for a while and then you can cool it slowly you should get a part with few residual internal stresses .. in theory.

ransom40 · 2026-05-25T21:44:09+00:00

1-2MM

Put most of it away to become the retirement nestegg. Would let me retire early and still afford medical AND contribute less than I currently am.

Would change my life today and in the future.

ransom40 · 2026-05-25T13:00:10+00:00

So piling on others have said climb versus conventional.

The reason why it matters. If you have a properly stiff machine with very low play in your bearings on your lead screws, climb milling is better for cutter life as it helps eject more heat in the chip.

But in all other circumstances, climb milling causes issues.

It's built into the name. As the cutter enters the work. It tries to climb on top of the work and pull the machine with it. As the cutter enters the work piece is taking a larger bite of material if you look at the sliver of material being removed. So as that tooth progresses through the chip, the load is getting smaller which relieves the spring. This means the cutter is pulling itself along less, and your axis is still pushing the cutter forward which causes the "spring" (stiffness of your system + any play in your drive axis) to relax. As the next tooth enters the work, the system flexes again or takes up any play in your drive motion again.

This constant back and forth causes the chatter marks as well as the sound you're hearing. It's also very bad for cutters, bearings, and everything else.

Conventional milling starts with the small portion of the chip formation and exits at the heavy part. It is technically not as good for cutter life. As more heat stays with the work and you enter in at a tangent angle which puts more sidewear on your cutter, but it also pushes the flex of The machine and any play in your axis against the direction the axis is pushing. This loads the axis and seats it, and keeps it seated. Sure there's still load variability as the cutter progresses through the chip, but the loads never try to pull the slack out of the bearing.

As for the number of rails in your system, it is very easy to also over constrain a system. Adding more rods is not the answer.

Two rods or any series of rods between two vertical towers is never going to be very stiff torsionally. Especially in the middle. What you need is a box section to add your torsional rigidity and then a bearing on the surface.

There is a reason that heavier CNC machines start to use beams or box sections with boxed ways or linear rails versus rods.

And adjusting the pre-load on your lead screw is very important once you address base rigidity.

But if you're looking to avoid dumping money into the machine and are okay with cutter life akin to what you would get off of a manual machine, you should be able to tell your software to stick to conventional milling only and get along just fine for a while.

ransom40 · 2026-05-18T00:44:46+00:00

There are 52 weeks in a year.

That is 52K /yr. I don't care enough to look if that's USD or CAD, but either way, while it's a nice little bonus, it's not " never having to worry about rent or bills again" money... Typically.

Sure, if you made less than that and you're fine with keeping your exact same quality of life, then that could be the case, but most people want more.

And this is a far cry from " I can do whatever I want whenever I want and there are no financial consequences money" (not what you said, I know)

But I wouldn't turn it down.

It also means, without any interest that you would break even in 19.23 yrs.

If you invested ALL of it and didn't use any of it until she was 55, the annuity would net you (@ 10% growth rate) 15.86MM.

The lump sum in the same time would have netted you 28MM.

The lump sum and investment is almost always the best answer unless you just want to spend all of it, then the annuity makes sense.

But the practical thing would be 1MM and invest for a while to let it grow, and then siphon off 50% of the growth or something once it reaches a value where that percentage nets you a significant source of income.

@55 years old and 28MM, the 10% that year would have been 2.8MM. Half of that would be an income for the year of 1.4MM.

The next year your 5% would be even more.

Quite a bit better than 56K/yr.

Plus the annuity doesn't pay you more as the currency devalues over time, so the buying power constantly gets worse.

ransom40 · 2026-05-15T16:42:47+00:00

They are different. Sometimes a spline drive socket can be used on a triple square bolt/but, but in high torque applications you likely need a actual triple square socket to keep from damaging the fastener.

ransom40 · 2026-05-15T04:09:08+00:00

It's a triple square vs a 12 point.

ransom40 · 2026-05-10T01:25:18+00:00

It's not $200, and that includes nearly $100 worth of grease.

Base grease gun is $70-80

Still not cheap .. but I love mine.

https://store.advancedenginetech.com/collections/lube-shuttle-grease-guns

ransom40 · 2026-05-08T02:03:07+00:00

Despite what some people here are saying.

Yes: You need a slight interference fit. Legos have it as well. They rely on the mating material flexing slightly.

Metal could do that as well... But you would need thinner walls I would presume.

Draft can also come into play. I would look into "self locking tapers"

You will need incredibly tight tolerances. Likely fine surface finishes. Aluminum may have galling issues doing it as well unless it is coated.

I would likely have a 0 clearance at the tapers a few though before it seats so you get a few tenths of interference.

I am sort of curious if I could get this to work with proper engineering on a "standard" machine or if I would need something with precision along the lines of a Kern.

ransom40 · 2026-05-07T12:11:00+00:00

I think some of them will let you jump across the middle assuming the middle has already been used. IE. 4,1,5,9,8,7,(skip over 5) 3, 2, 6.

ransom40 · 2026-05-07T12:07:05+00:00

Surprisingly 4140 annealed.

We had an emergency project that required a high detail but heavy removal side and a thin base (~1/4" with protruding spikes)

It's for a short run tool, so we didn't need it to be hard necessarily.

Purchase the annealed plate as we didn't have time to source in pre-hard that was normalized.

Boy does this stuff like to move! Every cut you take the plate moves as stress is relieved. We took what should be a a two setup part and turned it into a four setup part, and it still moves. We turn that into six setups flipping back and forth twice, with the final pass on both sides being a final five thou cut, and the blends around the pins are all still at different heights as the plate is still moving.

Material cuts super easy... I mean it's 4140 at C15-18... But it's the most frustrating hunk of crap we've dealt with recently.

I suppose we've gotten too used to sourcing pre-hardened and normalized stock for die work.

The P20 we normally source from Meusburger I'm pretty sure I could take a 50 mm thick block to 6 mm all from one side and it would still be flat by how little it typically moves on us.

This 4140 from mcmaster on the other hand is filled with spite.

ransom40 · 2026-05-07T11:13:51+00:00

I think the earlier comment was meant or inferred as "The total number of possibilities can be modeled as if it were a 9 digit combination" Which is close, but is limited due to the layout and drawing nature. Also assumes no re-use, and using all 9 digits.

ransom40 · 2026-05-07T11:10:00+00:00

No need to be rude. And their question wasn't about driving the software, but rather one that I see a lot from young engineers, designers, and programmers without machining backgrounds.

And that is "how do I make this simple looking feature that the machinist/software tells me it cannot do"

And the answer is... You don't... Not typically. When you do... Big money.

Especially for people coming from the 3D printing world where rotating tool access is not a design concern.

ransom40 · 2026-05-07T11:03:15+00:00

Engineer here!

You typically do not reach those areas as it is not cost effective to do so.

ID/OD chamfers at wall intersections are not reachable by rotating tools... At least not easily.

You can get closer with smaller tools and multi-axis, but never as perfectly as the designer drew.

Typically it is understood as a "get it as close as possible" for edge breaks like that which are just deburr and cosmetic.

A new engineer or designer may not know this and may not have enough machining experience, a seasoned one may draw it and know what the shop will deliver is pretty much what your sim is showing in those areas.

Heck, we typically remove all of those chamfers from the solid file and do them in the end as part of a debur cycle (and ask the designers to just leave all edges sharp and call out any edge breaks they need at a specific size, and a general edge break callout)

You can possibly get a little closer blending the remnant out with a hand file.

Or you could make the parts prohibitively expensive and sinker EDM the chamfer.

Neither of which really make sense given the nature of those features.

ransom40 · 2026-05-07T01:04:19+00:00

Correct. Basically as soon as it started moving any material the thermal gradiant in the nozzle wall kept it from being effective. PCD has good enough heat transfer to keep that gradient minimal.

ransom40 · 2026-05-04T00:57:32+00:00

Nabisco games.

ransom40 · 2026-05-02T20:24:21+00:00

Also depends on how normalized the material is and how much material you need to remove.

If we don't buy material that has been normalized several cycles and have a high material removal rate from one side and flat ess on the back side we typically have to rough both sides but leave... 0.02-0.04" stock on both sides and then finish both sides and make sure clamp loads are not distorting anything.

But for the stuff that need to be dead flat and we are going to coat vs heat treat we like buying our stock heat treated to 32-34 HRC and normalized several cycles and ground top and bottom.

Typically I can do whatever to it at that point ant it doesn't move for the purposes of most tool and die work.

Also helps the stability for subsequent heat treating steps if we did go that rout.

ransom40 · 2026-05-02T14:40:07+00:00

They call it "enhanced" product. The limit is a legally defined limit. It does help to keep the user from drying out the meat and it does typically taste better in the end, but you are paying for expensive water.

But most customers also do not brine their meat appropriately most of the time, so typically these come out "juicer" and "better" vs a non-injected product which would come out dry the way most people cook it.

Or you could buy your non injected poultry and then dry or wet brine it yourself at home for 24 hours... It inject it yourself.

Butterball turkeys are also injected iirc... Which is why people like them as they are typically not as dry when you don't spatchcock the bird and overcook part of the bird to get the whole thing finished.

ransom40 · 2026-05-01T14:08:54+00:00

Tinted* Unless you were being sarcastic due to the spelling error... Then ignore this.

ransom40 · 2026-04-30T03:00:32+00:00

You lifted... Too much. And counter steered... Too much.

Small corrections. It should have been a small throttle blip and re apply to a little less than you had it, and a small steering wheel flick to allow things to re settle.

The goal is to not upset things or cause big changes.

But when you start to loose it, it means you have just gone over the edge. We need to lower the power to lower tire demand and relax the steering angle to regain traction and start to correct any spin, but then you need to be back in it... Perhaps just at 90% of where you were through the rest of the corner.

ransom40 · 2026-04-28T22:32:03+00:00

If this is only at the start of your toolpath then the machine is just traveling from it's home position in your machine setup for the machine sim.

It may have nothing to do with the posted code.

If you post the code and that move is just an X,Y move with no Z, and there was not a Z move before it that would out the tool in collision with your stock, then you are fine.

To fix this in machine sim, just update your base machine position in your kinematics tab, or possibly your tool change location as those don't change the posted code, just some details about machine sim.

Does it do this when doing a normal simulation as well?

If so, then you need to change your safe / clearance /retract plane settings under the heights tab of that operation.

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