What is SFM? - Saga Saturday 011
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- Опубликовано: 12 сен 2024
- Welcome back to Saga Saturday folks! New year, new pen! In this episode, John and Angelo talk design specifics, tolerances, tool life, and try out a new (gorgeous) material for the pen sliders and buttons.
John also had a revelation over the break about SFM! What is SFM you may ask? And how can you be optimizing it to improve your parts? John dives deep into this and more.
CORRECTION: SFM actually stands for Surface FEET per Minute, not Surface FEED per Minute. Sorry for the error in the video!
More interested in SFM than John and Angelo talking design and new material? Skip to 11:42
Enjoy!
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To find approximate RPM the old machinists would follow the formula: RPM=(CSx4)/D which is essentially the same as what we use today: RPM = SFM X 3.82 ÷ Tool Diameter, just without the division. So simply put: Multiply the SFM by 4 and then divide the result by D.
Nice try but CSS stands for Cascading Style Sheet.
Depends on the context of the conversation.
Acronyms are thrown around all the time, I (and no doubt plenty of other people) could give you 3 more meanings for CSS.
Canadian Secret Service 👍
I think he was joking, but there's no winky face so I'm not sure.
John, give the guy a break. He's obviously not the sharpest insert in the shell mill.
Love this topic. Gets even better when discussing SFM for broaching, planers, tapping. Real technical stuff like that gets me.
I believe in the machinery’s handbook they define it as the theoretical linear footage of material that passes over the tool tip per min
John for production gauges we get go/no-go setups made up with the red and green ends. Individual gauge pins are only a few bucks a piece and it is a really easy way to check tolerance during a run. We also use ring gauges that are custom made (again, not crazy expensive) for OD checking. We run a lot of +0.0005/-0.0000" type bores on small parts and gauges are a life saver.
John Grimsmo being ever so slightly picky? Never!! 😂Don't ever change, your attention to detail is why your products are in such high demand.
It's kind of interesting that it's focused on the finished product and not something like somewhat proper feed speeds. But then again, time crunches.
Another classic example of 'not having time' to do something right, but having time to do it a dozen times. I fall for that trap WAAAAAY more than I want to admit.
Thank you for the tip with Surface Speed. It is the right one thing about that you dont think during the work.
IC stands for inscribed circle. It's the largest circle that will fit into the insert profile without going past any of the edges.
John for W style of insert you go ti take to account chip clearing . Because in a small bore more Chips are stuck in the hole less coolant get inside in the cutting zone . The sfm is One way ti reduce chip jamming but if the insert is broking down again any few parts try to routhing gradually in Z ...
I usually turn stainlees of 304/316/420 aisi and before finishing we blow away any Chips in the bore ... And for insert i use ccmt of iscar brand (i don't Remember the grade of the coating ) and for finishing dcmt
www.iscar.com/Products.aspx/CountryID/1/ProductId/5389 www.iscar.com/Products.aspx/CountryID/1/ProductId/5390 iscar for routhing and for finishing "taegu tech dcmt 11t304 VF, TT5080 M15 coating" . in small parts we used the same type of insert but with a small size circle. taegu tech dcmt is great for finishing in a wide range of material
Attention to detail is what makes a product magical. If your making product in small runs attention to micro detail is what your wanting to purchase.
I think you should definitely invest in some gauge pin sets. With a working tolerance on your parts of +/- .001, Z tolerance class pins (+.0001 max) should be good. Alternatively, a small bore gage or ID micrometer. None of those tell you if the feature is out of round though. You'd need a groove gauge or a 2 point bore gauge for that. Check out Dorsey Metrology International. The point is that you don't have to invest in something as crazy as a CMM, but you should probably use something other than an endmill shank :P And since you have a limited number of specific parts you make for your own products, you might even consider making custom gauging fixtures (or having them made). I work for a company that also makes its own products (firefighting equipment) and half of our gauging is custom made to check a particular critical feature.
You weren't using CSS before? You've been missing out! Not only does it benefit tool wear and surface finish, but it can also decrease cycle time when you program your feed rate in IPR mode. As diameter decreases, RPM increases and thus IPM increases, saving time. Of course, that doesn't apply if you've been running your SFM 5 times the recommended value all this time lol
I'm not a fan of trigon insert tools personally. There's too much potential for the insert to rock in the pocket which damages the pocket leading to more rock, etc. Basically, a trigon has 3 surfaces that it has to locate to in the insert pocket while triangle and diamond inserts only have 2 and those 2 surfaces support the insert in both X and Z directions while trigon pockets do not.
A friendly reminder ;) If a lot of tolerances are critical like they seems to be, don't forget to stack your tolerances to make all of your parts work as they supposed to. But it seems that you guys are on top of things. Can't wait to see the results! Keep it coming!
Weird, have you tried using a custom sized reamer for your high-tolerance hole boring?
Angelo's new name: "10K" or just "kicks"?? What do you think?
Yes!
Man he looks tired af. OK I would not sleep either if I could play with some CNC machines. But at some point it gets tricky deciding if he had a fight , no sleep or both.
I think better with rest, I also sometimes come up with better solutions, but sometimes out of desperation with little rest or sleep I come up with something, but that is a rarity.
If you want to try it I have an EF mount Tamron 90mm macro I could lend you for a couple weeks.
THATS BECAUSE MATH IS MASTER. BUT YOU ARE PROTOTYPING SO PRINTS ARE MASTER TILL IT WORK THEN TOLERANCE.
Nice video like the the content keep up the good work 😁
To calculate proper RPM: (3.82 × SFM) ÷ cutting diameter. Cutting diameter would be your tool diameter for milling, or your material diameter for turning. Recommended SFM can be found fro your tool supplier or from the machineries handbook.
I thought SFM stood for "surface FEET per minute." I don't know if it was a type or not but in the video it says "surface feed per minute"
You're right! Sorry, that's a typo in the video. I corrected it in the description. Thank you for pointing it out!
@@StoryUnlocked oh ok, cool. Thanks for all the great videos.
John, is there a reason the Fanuc 0i-TF is written by a felt pen :)
Are you generating the 2D drawings from fusion itself?
yes! the geekery has returned!
Hey grismo, tried to get in contact with you via facebook and havent got a response. Just bought a nakamura tome as200l with y and sub. had some questions about postprocessor.
You picky? Naaawwwww, couldn't be! Just can't imagine you being picky! Come on John, you hhhhaaaaavvveee to be pulling our leg on being pick! For those who didn't get this post, it was dripping, absolutely DrIpPiNg with sarcasm;o) I think a large part John is so successful is his pickynes. Perfection in every aspect. Looks great John.
since when do you have an intro
How do we get a saga
2019 goals, Own a Saga pen and get lucky and own a second norseman
Hi John,
Surely if you have entered your tools and the material type into Fusion it should be doing the correct calculations for you? or are you overriding them?
To be quite honest before you even start cutting any material, you should double check to make sure you have the correct feed and speeds.....
He was setting the RPM to 3000 in Fusion, it's a bad habit from the Tormach days. It's more clear when he's talking about it on Friday's podcast.
@@DenzilMakes Ahhh ok that's still bad practice... I don't listen the podcast.
I don't use Fusion, I don't have any CNC machines only manual. I didn't even know that you could do that.
What are those things that look like tops of soda cans shown at 0:06?
Bottle openers
@@xenonram
Ah, that was one of my guesses.
Bottle openers that look like the top of stuff you drink out of?
Yeah ... Guess hirudin knows what hes talking bout.
@@frogman708
Hehehe, nice!
Those are actually (golf)ball markers from Tyson Lamb
Hi John I hate to ask this question because I'm sure your sick of getting it but what the hell lol. Do you ever think you might do a "Production" run of your knives?? I don't know if that would be like some custom makers like Farrum Forge that partner with Massdrop and have We Knife Co build a run of there custom knives. Witch would be great but your company has so much of your own equipment mabe you would just do it yourself but on a lower level then your more expensive runs now? Any information would be appreciated but if your just not answering questions like this anymore I'll understand lol. 👊😎
John, I love your videos and respect you so much, but I can't believe you would allow a part to be run at 290sfm. What the hell man?
dude that was Swedish not Norwegian!
I'm kinda shocked that you've been making knives, pens etc. from all kinds of materials, for how many years now, and your not intimately familiar with sfm. How many knives have you made to this point? How did you manage to even finish one? Sorry I was just really shocked when you started talking about sfm as if it was something you just recently started thinking about.
It'd be easier in metric. 😎
TIAAA
Who wants you to watch you work out your problems ?
I do.
Me too.
Pretty much everyone. That's what this channel is about... Learning. You want to see knives, go watch Skelton. You want to watch machines run, go watch the hundreds of "super fast milling" or "10 fastest cutting mill tools" videos.
this is EXACTLY the content that made grimsmos channel, it was content like this that got people invested in his product and journey. I could buy any pen, there are plenty of nice pieces, but I'm waiting for a saga as I want to be part of the challenges and ultimately the successes.
i do