Inspecting some HBM ER25 Collets and trying out some bue nano inserts

To celebrate my 3 year channel birthday I bought myself a set of ER25 collets from Dutch reseller HBM. In this video I try to find out if they are good enough to keep, for when I start machining my own collet chuck for on my vintage Karger lathe. Oh, and I also start testing some blue nano ccmt inserts in this video.

FYI: I am trying to make a little money for my youtube hobby through the Banggood affiliates program. Follow the link below, buy something you NEED and I'll earn some commission. Doesn’t cost you anything extra. You're basically taking money out of Banggood's pockets and putting it in mine :)

[richardwhitfield]

"Oh! That's horrible. That's a disappointing Let's try again. It's not like I''m fucking up something expensive here"



Love it!!

[ajofscott]

A good place to start would be fix the spindle bore then worry about the collet chuck.

[robbiestevens]

It's interesting that you have a better finish up the front, maybe try giving the tip more relief below the tip? Swarf may be getting trapped and marring the finish and the smaller the diameter the less clearance you have on the boring bar below the cutting edge. Also although it may increase chatter, could try cutting upside down on the opposite side of the bore? Love your videos!

[MichelBricole]

10 000 subscribers !!!
Congratulations, my friend :)
Love your videos :)

[rnable]

It's the low cutting speed what causes the problem. At 600 rpm ø25 has a surface speed of about 47 m/min. And then decreasing as the diameter gets smaller. You should probably have a surface speed of above 200 m/min on those inserts. Which means 2500 rpm at ø25.

[mosfet]

I have those collets in 32mm and they are very good. The small collets have a reduced slit by design. You really have to grind the internal holder bore with a tool post grinder.

[kymcopyriot]

The consumer in you got the upper hand? Hang on...there's a consumer in YOU? Nah! Your machinery is even older than mine! You're a hardcore recycler!

[MattysWorkshop]

Gday, the blue nano inserts I’ve had great success, I found the there really good on harder materials, I think they are bloody great, I use a battery drill to drive my compound slide to keep the same speed and find this helped a lot, the collets look a hell of a lot better then the banggood experiment. Thanks for sharing mate, Matty🇦🇺

[garyskowbo]

Hi RM thanks for sharing another great video. I see you drew some blood on this one. 🙁 An idea, maybe you could turn a cone to the 8 degrees and then use some grinding compound to get a better finish.🤔 and I think you might be right about the blue nano inserts.

[garthdaddy]

There is a relationship between the collet nut and the taper of the front of the collet . Depending how tight the thread is the nut will float on the collet or it will deflect the collet to one side depending on how close the overall tolerances are.
Try to tap the high side of the collet nut to improve your run out or look into chasing the threads to ease the nuts position. You must have a precision carbide cutter to be sure you are measuring the arbor run out and not the rod you have placed in it.

[excavateboy]

Carbide tends to leave a better finish at a higher speed deeper cut and slower feed

[DolezalPetr]

the blue nano inserts I get from aliexpress are very high quality, they turn very hard steel like butter and produce nice finish, other inserts I have do not turn hard steel as well

[ianhaylock]

Not a machinist, but couldn't you clamp the outside of the collet chuck in a four jaw chuck. Then you could adjust the outer dimension for zero run-out. Then cut the internal bore and get a chuck with zero run-out.

[dalegriggs]

rM,
I’m gonna stand by my previous comments on the Blue Nano inserts. You cannot expect good finish results with any carbide tool at such a low speed. I know your lathe is limited to 600rpm but that’s just not fast enough for carbide cutting. Also a hand fed cross slide always gives irregular finishes results. Even using a drill with an adapter will improve most finishes. It gives a steady, consistent feed. Something turning by hand cannot accomplish. I recently ungraded my collet set with a 25 piece set. They are marketed by an American company but were probably China made to their specs. I had an 8 piece Banggood set prior to this. The difference between the two sets are quite remarkable. The Banggood set was very inferior. Their quality control leaves a lot to be desired, to say the least.
I here you on those aggravating shrink packaging covers on each collet. They are a fright to remove. I guess that’s better the Banggood practice of throwing everything together into a cheap zip lock bag.
Thanks for the review and Happy Birthday!

[hampopper]

hmmm I see old vantage lathe with brass bushings high run out in spindle and not checking the taper with machinist blue on the collet.

[stevelamperta]

You can get collets and a collet chuck with zero run out but your going to pay a lot more ! What kind of work are you doing ? the cheap stuff from ebay and amazon works just fine for home hobby stuff. What is it your doing that you need such perfection ???

[tooltimechris]

I think grinding is the only way to get that mirror finish you look for.
You only need to get the angle right. But I’m sure that will be an whole other video

Keep it going!

[hopper]

I'll have to go check the run out of the ancient 4S collets I have for the Stark lathe. From what I've seen of your ER32 and ER25 adventures I may be better off keeping the old stuff.

[cluvepilot]

A word of warning about your silver steel. It tends to be slightly oval, it is not precision ground as we think it is. Yes it is ground, but not precision ground.

[jokeahsmann]

ik wacht nog steeds op die afgekeurde collets van banggood die jij zo vreselijk vond