Cat 40 retention knob torque?

[Slixmix]

We bought a new HAAS horizontal and I need to set up a bunch of ER20 collet chucks. How many ftlbs should I torque the retention knobs down to? I also put a drop of removable lock-tight on them. Thanks.

[toolsman]

Something I found.

 

Torque Specs for Retention Knobs:

 

30 Taper = 40 ft/lbs

35 Taper = 40 ft/lbs

40 Taper = 85 ft/lbs

45 Taper = 100ft/lbs

50 Taper = 110 ft/lbs.

These reflect Maximum values for Techniks brand holders. Use these numbers as a reference ONLY. Actual torque specifications may be less or more for other brands. Request torque specifications from the manufacturer of YOUR toolholder.

 

Hope it helps, I have never needed loctite for a retention knob though.

 

Neil

[JazzBass]

Someone told me 85 ft/lbs a while back. I just tighten the $hit out of them.

[Slixmix]

Thanks alot! When I was running Mazak 50 taper machines we used loc-tight. These wittle 40 tapers probably don't need it. Anyone else ever use loc-tight? Just curious.

 

quote:

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I just tighten the $hit out of them.

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I was told thats a no no! You can actually bulge the bottom of the taper? Bad Rick!

[MitchD]

We use a drop of blue on them, note just a DROP of blue..heheh We torque them as well.

[JazzBass]

They did Loc-tite the BT-35 taper holders for our old Mori's before I started working here. We still can't bust them loose and that was 15 years ago! I never do it. What horizontal did you get? We got a Haas EC-400 a year ago.

[?Mark]

quote:

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Anyone else ever use loc-tight? Just curious.

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Use it on all 40 and 50 taper holders.

Also almost

quote:

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I just tighten the $hit out of them.

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Also was told it's a big no-no but haven't had a problem yet (set it and forget it as far as pull studs are concerned).

quote:

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You can actually bulge the bottom

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Bottom of a pull stud is well above highest contact point on a taper.

 

Mark

[Slixmix]

EC-400 it is! 12,000 rpm 30 HP with thru coolant. 60 tools. Gonna be fun.

[Guest CNC Apps Guy 1]

quote:

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I was told thats a no no! You can actually bulge the bottom of the taper? Bad Rick!

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It's a bad practice because even (as stated earlier) though it is above the taper in many casesm it is not in all and can cause fretting. I've personally witnessed it. I use my small Crescent Wrench for 30 and 40 Taper holders and just snug it up. NEVER had one loosen up either. Add some Loc-Tite if you're nervous.

 

HTH

[Psychomill]

Nick, how goes it?

 

Yep, I have always used lock tite as well. And on High speed 40 tapers. Although sometimes I get "out of habit"..

 

The biggest problem I've seen with the "tighten the sh!t out of it" method, is the periodic cracking of the pull stud right below the stud flange on the thread side, in particular to thru coolant studs. I've seen these tools come apart in the machine at full speed. Thank god no personal injuries yet over the years.

 

You want a wake up call??? How about a 50 taper pull stud letting loose at 15K??!!! HELLO!!

 

[jeff]

We just take a crescent wrench and snug them down a little bit past finger tight.

Never had a problem in the 10+ yrs I have been running these mills.

both 40 and 50 taper.

[Slixmix]

quote:

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Nick, how goes it?

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Goin great Rob. Thanks. Hope all is well over there with you guys.

[Quickmike]

hey Rick O, If loctite reaches about 400 deg F will become soft and let go. Not sure if this is the best thing for a toolholder but it does work

[JazzBass]

Thanks Quickmike, I have some solid holders with broken carbide EMs stuck in them. I can't get the knobs off. I'll torch one and see if I can break it loose.

 

Nick, What are you loading on the pallet? Chick 1550's are working great for production work. Have fun!...

[medaq]

Having seen one of my guys not tighten the knob enough, and see it come loose in the spindle. I went out and bought a impact wrench, and use it on a low setting. I have never had one come loose yet since we implemented the wrench..

 

Jim

[Eric S.]

Sounds like 85 ft/lbs IS tightening the $hit out of them. We have always just tighten the $hit out of them with a wrench but the handle is only 7" long. I'm sure this is under the 85ft/lbs but I have not measured it... I do not know how I'm going to get a torque wrench on it when the knob only has 2 flats on it

 

Rick

 

We are thinking about purchasing a Haas EC-400 as well. How do you like yours so far?

[JazzBass]

Eric, there's a socket you can buy that fits the two flat knob. Works killer!

 

Haas is Haas, It's a good little machine. The only gripe I have is the coolant tank and flow design sucks. Other than that, Its great to setup an run.

I cut about 1/4 the run time from production jobs I used to run on the Verts.

[Eric S.]

ahhh should have guessed.

 

Thanks

[G Caputo]

Here are the sockets

[Slixmix]

We went with the Toolex 6" double vise setups. Both pallets have 8 stations. We have a customer that makes fuel pumps for the locomotive and marine industries that is sending us a boat load of work. Mostly 1018 steel with a little aluminum. I talked the boss into to getting a probe also. New machine, holders, etc... Fun, fun, fun..

 

[iowajim62]

Hey Nick,

 

here's command link

 

http://www.commandtool.com/ctstore/showdet..._ID=73&CATID=16

 

nice toolex towers

[spade117]

in regaurds to retention knobs:

 

some of the people here used loctite on them,we have not had any problems. I was always against the practice because we used to interchange knobs between machines. Now we don't have that problem anymore. I have always used a spanner wrench with a soft hammer.

[cblythe3d]

Having never seen a pull stud come loose (exception partially screwed in by hand and taper failed to register in spindle)

 

Having seen many problems from overtightining, collets, studs, clamps, vises etc

 

except during tool change the bellvile washers maintain force.

 

Locktite unnessary. A decent snug works great and prevents problems later down the road