Maritool now has stubby BT30 3/4" sidelocks

[DavidScott]

I have been waiting for Maritool to get the 5/8" stubby sidelocks in stock and the last time I looked they also had the 3/4" type as well. So I got one of each in dual contact and was a bit surprised at some features on the 3/4" version, so here is a heads up for those who may be interested in them. The first surprise is the set screw is from the 3/8" sidelocks, which isn't noted on their website. Why is a good question, I suppose it is so you are less likely to distort the holder with the screw torque. The recommended torque for a normal 3/4" sidelock is 45 ft lbs and for a 3/8" is 16 ft lbs. With the smaller screw the end mill has about .25" of travel when the screw is just touching the flat. The other feature of notice, but not a surprise, is how much of the shank of the end mill is exposed to air vs contained in the tool holder. Anyway, this is an interesting tool holder but it seems to be of a "special" design for a specific need. Frank, when you see this I am curious as to how it came about? If you do another batch of these it would be nice if you left enough steel on the nose to contain the full shank of the end mill like your other stubby sidelocks, and use a bigger set screw.

Here is a photo showing the 2" and .9" projection 3/4" holders and the 1.2" 5/8" holder on the right. The end mill in the stubby 3/4" holder is all the way in. If you pull it all the way out before torquing the screw it would extend another .25" out of the holder.

 

[Vancbiker]

I use a 3/4" tools a lot on my 30 taper Mori. Ordered one of these stubbies to give it a try.

 

[DavidScott]

So, I thought that since I am posting this I ought to do a little of the due diligence I was going to do before using them. I know Frank has said in the past that there wasn't enough steel left of the holder for 3/4" stubbies to be stable, and the set screw would distort the holder out of round. With this in mind, I measured the width between the flats and between the set screw and taper with and without a tool in the holder. The results were so interesting I did it on all my stubby side lock sizes. Here is how much they grew.

3/8" .0001"-.0002" @16ft-lbs, max is 16
1/2" .0002"-.0003" @16 ft-lbs, max is 20
5/8" .0004"-.0005" @ 20 ft-lbs, max for this set screw
3/4" .0006"-.0007" @ 16 ft-lbs, max for this set screw stubby sidelock
3/4" .0003" @ 45 ft-lbs, max for this set screw standard length sidelock. I didn't expect to see this one move.

The recommended torque for standard length sidelocks with larger set screws is 35 ft-lbs for 5/8" tools.

I never thought to wonder what having a jack screw in the side of the holder trying to distort it would do. Next up is bluing the tools in the spindle.

 

[Pete Deal]

Good news thanks

 

[plastikdreams]

Sweet now u guys can really go ape shit trying to break those bt30 pull studs...not that I want you to ruin stuff, I just like the stories

 

[DavidScott]

Sweet now u guys can really go ape shit trying to break those bt30 pull studs...not that I want you to ruin stuff, I just like the stories

THE PULL STUDS BREAK BECAUSE THE TOOL HOLDER IS PULLED OUT OF THE TAPER DURING THE CUT. IT IS MORE A FUNCTION OF DRAW BAR RETENTION THAN ANYTHING ELSE.

 

[plastikdreams]

THE PULL STUDS BREAK BECAUSE THE TOOL HOLDER IS PULLED OUT OF THE TAPER. IT IS MORE A FUNCTION OF DRAW BAR RETENTION THAN ANYTHING ELSE.

Yeah and getting a little aggressive with a .750 cutter could do this, as I know .500 have done this.

 

[Vancbiker]

I’ve been using 3/4” as my main rougher/finisher for over 10 years now. Haven’t pulled a tool from the taper nor broken a stud. Most of my studs are from 1995-1996 when the machine was purchased by the original owner. Breaking studs on a 30 means you effed up somewhere.

 

[Garwood]

I love the pictures showing 3/4" endmills being massive in bt30 holders.

Here's a 3/4 endmill vs Cat50 for comparison.

 

[plastikdreams]

I’ve been using 3/4” as my main rougher/finisher for over 10 years now. Haven’t pulled a tool from the taper nor broken a stud. Most of my studs are from 1995-1996 when the machine was purchased by the original owner. Breaking studs on a 30 means you effed up somewhere.

It was moreso a joke

View attachment 393547

I love the pictures showing 3/4" endmills being massive in bt30 holders.

Here's a 3/4 endmill vs Cat50 for comparison.

That thing is huuuuuge

That's what she said

 

[Vancbiker]

View attachment 393547

I love the pictures showing 3/4" endmills being massive in bt30 holders.

Here's a 3/4 endmill vs Cat50 for comparison.

Hey! You makin fun of us less well equipped???

 

[DavidScott]

View attachment 393547

I love the pictures showing 3/4" endmills being massive in bt30 holders.

Here's a 3/4 endmill vs Cat50 for comparison.

It all depends on the parts your making. I know your Kit is fast but this is why I like my little 30 taper mills.

Oh, and my phase converter says it is using 4-7 amps and my compressor cycles once every 90 minutes while running those parts.

 

[Garwood]

It all depends on the parts your making. I know your Kit is fast but this is why I like my little 30 taper mills.

Oh, and my phase converter says it is using 4-7 amps and my compressor cycles once every 90 minutes while running those parts.

Brothers are awesome and I'm 100% jealous everytime I watch one change tools.

 

[Pete Deal]

I don’t use 3/4 tools much but for sure my haimer is going in one of those stubby holders.

 

[Vancbiker]

Received the super stubby 3/4" holder. Dropped an inch off the gage length of the tool assembly. Ran a couple simple parts that regularly repeat. Noticeably quieter and smoother in the cut. I'm pretty pleased with it.

Have a new job to do and will play around with my cutting conditions and see what increases may be possible.

 

[TAIWA NUMBA WAAN]

Received the super stubby 3/4" holder. Dropped an inch off the gage length of the tool assembly. Ran a couple simple parts that regularly repeat. Noticeably quieter and smoother in the cut. I'm pretty pleased with it.

Have a new job to do and will play around with my cutting conditions and see what increases may be possible.

What is your typical gauge length? I wish I could find manufacturers (other than MariTool) that make such short holders like his, but its seems like around here the shortest available is 2.0-2.4 inches for any collet holders, with 2.8" being the most common in stock, and I can't find anyone making dual contact endmill holders so short. Is there a night and day difference between a 1/2" endmill held in a 3" long collet holder vs a sidelock at 1" gauge length?

 

[Mtndew]

Is there a night and day difference between a 1/2" endmill held in a 3" long collet holder vs a sidelock at 1" gauge length?

In a 30 taper holder? Yes, depending on how you're using the end mill.

 

[DavidScott]

I have had a 50mm projection ER11 holder work noticeably better than a 60mm projection ER16 holder. Yes holder length makes a big difference, as does drawbar tenion.

 

[Vancbiker]

What is your typical gauge length?…….

Using the 3/4 super stubby holder dropped this assembly from ~4.25” to ~3.25. This is shorter than many of my 1/2” tool setups which run about 3.5” to 3.75”.

 

[cnctoolcat]

I wish I could find manufacturers (other than MariTool) that make such short holders like his

If Frank is the only businessman smart enough to listen to his customers, and actually make them what they want, then why not give him all the business?