How to improve surface finish on a lathe? Noga mist coolant tested. Roughing and finishing.

Testing noga mist coolant system. We use thermal imaging to see heat affected areas and view results under a microscope. We look at insert damage surface finish and thermal expansion. Using a WNMG 332 insert. I use Kool mist coolant

[@izantux]

Just discovered your channel and watched all the videos. Great to see a new machinist joining YT and I have found your content quite interesting, fresh and valuable. Thanks for taking the time and effort to produce the videos!

[@smallgaragemachineshop2715]

Thanks so much for the nice comment. It means a lot and I am so glad you found the content interesting. It takes so much more effort than I anticipated but it's well worth it if it's enjoyed by others. God bless...

[@simon9447]

Great vid! That pretty well seals the deal for me. With regard to your editing skills, you also did a great job there. I do a LOT of editing and I have no complaints with what you did. Your vid did what it was supposed to do which is to be entertaining and informative.

[@greglaroche1753]

It would be interesting to see a comparison of the different types and brands of threading inserts.

[@steveh8724]

Great video! The effect is so obvious and clear, and the micro and thermal imaging were nice additions.

[@smallgaragemachineshop2715]

Thanks so much Steve! So glad you are enjoying the videos. I promise more interesting stuff to come. Thanks for the support.

[@hilltopmachineworks2131]

I have the Noga Mini Cool and I like it for it's versatility. Having 3 lathes and 2 mills and 1 surface grinder in the shop I don't have to have a dedicated coolant system at each one. I can set up the mini cool at whatever machine I am using.

[@DK-vx1zc]

Very interesting! Thanks for creating and sharing.. And for encouraging me to get a mist cooler. :)

[@smallcnclathes]

I hope in the year since this was uploaded, you have learned to run higher surface speeds. It may be my imagination but the dry surface finish appeared to improve with the higher rpm. In 4140 at around a 1" diameter I would have been running about 1200 rpm to see how it went. I have several Nogas and they work great. Apart that is from 2 with broken blue outer hose bits that cannot be repaired. That was disappointing considering the price. Cheap ones do not, in my experience work as well as the Noga unit which for me anyway, seems to run quite consistently. Those test cuts were much longer than they needed to be, to show a result. If I have a long cut being taken to make a part I usually speed it up in the middle to try and prevent viewers falling asleep. Making a part I can't change the cut, but making test cuts of my own choosing I would make them just long enough to show the difference. Well done on the camera angles and lighting, not easy is it?

[@johndebrular979]

A great video - a shop tour is next.

[@BigSkyCurmudgeon]

i like the premise of these units, however if you use them in a commercial setting, making large chips the entire shift, change the tubing to a braided wire covering instead of the plastic snap couplers. a big ol blue #9 4140 chip will stick and melt those soft things i mean RIGHT NOW.

[@DEtchells]

Wow, what a great test, on all fronts! The thermal images were particularly interesting. I’m a complete noob, so I’d never thought about the effect of cooling on dimensional accuracy before: it’s obvious when you think about it, but it probably wouldn’t have occurred to me without hours of hair-tearing first :-) Also great to know that the mist doesn’t seem to fog up the shop, that had been a primary concern. I’m short-listing one of these for my shop now. (Also great to know that not all are created equal and that the Noga is what worked well for you.) Thanks for the great work, I’m a new subscriber now!

[@smallgaragemachineshop2715]

Thanks so much Dave for the kind words! Look forward to sharing more videos with you in the near future.

[@federiconavarrocabezas257]

Thanks for your effort, a great video full of information.

[@smallgaragemachineshop2715]

Federico I appreciate you tuning in. Stick around there is more to come. Thank you

[@NottinghamshireNick]

Love the video and the information and tests you’ve done show clear benefits. Please can you clarify where you’re aiming the most coolant - it is mostly at the tool contact point or the top of the material being cut? Asking as I have a cheap copy of this system I’m now thinking of setting up. Haven’t bothered before as wasn’t sure on the likely benefits. Thanks again, Nick

[@smallgaragemachineshop2715]

Hey Nick thanks for the kind words. I try to point the coolant at the contact point or slightly favoring the work side. I have found that works best for me. I really like the Noga setup. I use it on the mill as well with similar results. Hope that helps. Thanks!

[@NottinghamshireNick]

Thanks for the quick reply and the additional info. Looking forward to your next video - subscribed and bell rung even before you replied. Please keep it up!

[@smallgaragemachineshop2715]

Thank you Nick! I will do my best.

[@billdoodson4232]

Just found your channel and I found this quite an interesting little experiment. However I do think that your spindle speeds are far too low for carbide tooling. I just stuck in my Sandvik calculator for their carbide inserts and for a 25mm dia steel bar it was showing a spindle speed of over 5000 rpm. My own lathe will only run at 1000 rpm and I am in the process of changing it so that I can get up to 3000rpm so that I can make better use of my carbide tooling. I will probably have a look at getting one of the cheaper mist coolers to try it out.

[@smallgaragemachineshop2715]

Hello Bill. I Appreciate the kind words and the criticism as well. The mist coolant has worked out well for me. Keeps the mess to a minimum and certainly helps out for finish and tool life as well. Thanks

[@mike94560]

Why do I find these videos after I already have one? I like my Noga mist system.

[@joell439]

👍👍😎👍👍 Thanks for all the interesting experiments and clearly presented results. I truly appreciate all the energy and time to record, edit and share. Had you used the NOGA system before? How was the mist cloud throughout the shop? I've heard the cheap alternatives are quite disappointing and lack good control.

[@smallgaragemachineshop2715]

Thanks Joel! I am so glad you liked the video. I have had the Noga system for a few months and have been very happy with it. It does not fumigate the shop with the Kool Mist coolant. I previously had other coolant and it made the shop unbearable. appreciate the support and comments it means a lot! I have some more videos on the works so please stay tuned. 👍

[@orangetruckman]

Good stuff 👍🏻

[@ianbertenshaw4350]

Awesome video ! I wonder if there is a noticeable difference in the finish when using the coolmist sort of thing and brush on cutting fluid ?

[@smallgaragemachineshop2715]

Hey Ian thanks for the comment. I have had much better luck with the mist coolant. But this is a great idea for a comparison video! Glad you liked the video and thanks for tuning in!

[@Warped65er]

Quite interesting, informative, and well done video too.

[@smallgaragemachineshop2715]

Thanks warped I appreciate these kind words. Thanks for tuning in my friend. I hope to keep that feeling going in future videos as well. Thanks for watching it's appreciated.

[@greglaroche1753]

I’ve been enjoying your videos. Thanks! I am now subscribed and waiting for more. What’s the minimum CFM needed for the Noga Mist?

[@smallgaragemachineshop2715]

I have run it as low as 20psi without a problem. I generally run it around 30 for most things. I will look in the manual and let you know what they actually recommend. Thanks for the compliment glad to have you as a subscriber!

[@melgross]

The question about the cheap ones may not be function, but longer term reliability. I find that the plastic “hose” goes bad. Sections tend to split, or crack.

[@kensimolo860]

What lathe are you using? That can make a large difference on what one can do with carbide so knowing would help us when making a decision about what to do for our lathe. I really like your video by the way

[@smallgaragemachineshop2715]

Thanks Ken. I am using an old 1919 Worcester lathe 14 inch swing. I converted it to DC power with a speed control and that certainly helps things. Although I am still limited to what the old Cullman drive can handle. I am planning on doing a little shop tour soon. I appreciate the comment and you tuning in. Thanks again!

[@sto2779]

Which provides better surface finish, mist or flood coolant? Thanks.

[@pawel102]

What was diameter of part? What was sugested cuting parameters from insert company? What was corner radius of insert?

[@habaristra6248]

HUGE Thanks

[@billshiff2060]

Turning unknown chemicals into aerosols and spraying them into your room to breathe in is not a great idea, no matter who "says" it's "safe".

[@taiwanluthiers]

I just tried oil/coolant and it didn't really improve the finish, perhaps it has to do with the formulation of the coolant? The oil I was using was tap magic. In my case if I use an insert with finishing geometry (means sharp tip and all that) it would only produce a good finish if you crank the rpm over 1000. However the finishing insert produces very dangerous ribbons if you make the depth too much (in my case more than 0.1mm) that would cut you very easily.

[@smallgaragemachineshop2715]

Hey Tyler. I used Kool Mist 78 for the video. I previously tried other mist coolants and the results were not as apparent. Just curious how you are applying it?

[@taiwanluthiers]

@@smallgaragemachineshop2715 I just kinda drip it onto the insert as it cuts. It didn't really improve the finish though it did improve chip evacuation. I tried water and the same thing happened. Only way I can get a good finish is high RPM and finishing inserts. If it helps my 4140 was annealed, and it machines poorly because it's so gummy. If you are using pre hardened steel then the result will be different.

[@smallgaragemachineshop2715]

Ok I understand. I feel the mist coolant provides constant cooling and lubrication. I tried dripping tap magic on a part and it smoked out my garage, got my wife very angry, and didn't do anything for finish. If you don't mind me asking what kind of lathe are you using? Is this lathe new to you? Are you just getting into machining or have you been at it for a while?

[@taiwanluthiers]

@@smallgaragemachineshop2715 I'm using a Victor 1630 lathe, I'm in Taiwan and victors are made here, so I used it because I can find information about it. The ways that the tail stock rides on is severely worn and I ended up epoxying pieces of copper onto the ways to keep the tail stock more or less consistent height. I never gotten tap magic smoked up, it only happens if your steel is red hot. I don't have a noga mist cooler, the lathe is supposed to come with a flood cooling thing but I never used it because I can't find the plumbing for it (it might have been ripped out by the previous owner). I've been at machining for a little bit, when I was in the states I was doing gunsmithing. Can't do that in Taiwan because it would be illegal as hell. In my experience, and I see others do this, is that a lot of people machine with carbide dry. Carbide needs to either be kept dry or flooded, or else heat stress will crack it. I find that heat treating the 4140 generally makes it machine much better, where even a normal (non finishing) insert will produce a great finish.

[@RuianCarbidetools]

Okay you are right😮

[@billshiff2060]

What happens when 10 years from now they find out that breathing that mist causes your chest to explode? Turning unknown chemicals into aerosols and spraying them into your room to breathe in is not a great idea, no matter who "says" it's "safe". You might remember such hits as "cigarettes do not cause health problems" Or "Leaded fuel is perfectly safe" or the unforgettable "BPA plastics have no environmental or health impacts".

[@tracygalloway4558]

Thermo shock on that insert kills the life just saying. No coolant then hit it with coolant.

[@BigSkyCurmudgeon]

too slow cutting speed- double it and a feed rate if near point radius. jeez thats killing time.

[@billshiff2060]

Yeah that is way below the rated speed for inserts. The finish will improve but the heat will increase. I have no problem with the heat just compensate for it.

[@chrisstephens6673]

Painfully slow, even for a home shop. So slow you could use pre HSS carbon steel tools.😉

[@chrisstephens6673]

So slow i lost interest half way through.

[@SoBoring136]

Sure u didn’t I’m erase the feed speed I think u did