Bar puller suggestions

[Cole2534]

OK, I'm trying to sort out the best way to pull 1-3/8" steel bars. The Royal cut-off/puller is sweet but too rich for my blood.

Other than the spring loaded cup things, is there a middle ground in pullers?

Part of me says just make up a gripper of my own with some springs and jaws, but maybe there's another route?

 

[T_Dubs]

I have been looking into the same thing. I haven't tried it yet, but I read somewhere that a guy suggested making a delrin piece that was .010 smaller in diameter than your part and just run it up on your part and pull it back. Seems like it'd work but I don't know. Be worth a shot if you had some delrin laying around.

 

[Herding Cats]

I made a few with the intention of selling them as a product but just haven't had the time. If you guys are interested I can try to post up the assembly file tomorrow.

 

[g-coder05]

If you’re ever down around Cleveland Tennessee stop by D&W machine. I made a self contained integral bar feeder that stuck out the back of the spindle about 8”. It pushed up to 1.5” bars 40” long with no problem. Front loaded by hand half way then the turret for the last part.

The tool back works as the stop the the Chuck instantly opens and closes. Super fast bar advance. They bought a SMW-2100 but that spring loaded deal was si much faster they fold the service feed.

I made it in the 90’s for bushings and they borrowed it and decided they wanted it. 20 years later they still make 3/4” stainless burner tips for Commercial grills and use it to this day. Wish I had a pic, it’s crude but serves the purpose.

 

[Mud]

If you’re ever down around Cleveland Tennessee stop by D&W machine. I made a self contained integral bar feeder that stuck out the back of the spindle about 8”. It pushed up to 1.5” bars 40” long with no problem. Front loaded by hand half way then the turret for the last part.

The tool back works as the stop the the Chuck instantly opens and closes. Super fast bar advance. They bought a SMW-2100 but that spring loaded deal was si much faster they fold the service feed.

I made it in the 90’s for bushings and they borrowed it and decided they wanted it. 20 years later they still make 3/4” stainless burner tips for Commercial grills and use it to this day. Wish I had a pic, it’s crude but serves the purpose.

I'd like to see that,

 

[Cole2534]

I'd like to see that,

Me too. TN isn't really on my commute.

 

[g-coder05]

My cousins the owner there but On perma vacation. I’ll call and see if I can get a pic with some details from the operators.

 

[AJ H]

I know the Royal is expensive, but you won't regret buying it.

 

[lobust]

I used one of these for years and it never once failed:

Bar puller

SG

www.berg-spanntechnik.de

 

[Cole2534]

I know the Royal is expensive, but you won't regret buying it.

$1200? I can't get there. I'd finance a feeder first.

For the time being I'm going to cobble something up. Going to groove the bar behind the cut off and make a dedicated head to grip that groove. The groove will be machined away as part of the next part and the additional stickout won't affect anything.

 

[Zahnrad Kopf]

I agonized over the choice several years ago to the point of delaying the purchase by at least a year. That was stupid. I ended up taking a chance on the Micron EME Smart Bar Puller and kicked myself for at least two years after for not purchasing it sooner. It has been FLAWLESS. Worth it's weight in Gold to me. Simple, but EXTREMELY and elegantly effective. I'd buy another today without hesitation if I had need.

 

[Mud]

Going to groove the bar behind the cut off and make a dedicated head to grip that groove.

We do exactly that for a part from 1.125" hex steel, works great. Just a full depth notch in a piece of 1/8" CRS.
We started with a coolant activated gripper - Meh, wound up selling it. We've been using this one shown for years for everything except the hex, bought from Ebay, have never found the manufacturer. It just pushes on and pulls off like the one ZK listed.
Google shows a Dri-Lex company in South America, I haven't found anything else. I also have all the parts for a Royal, but have never put it together.

 

[lobust]

bought from Ebay, have never found the manufacturer. It just pushes on and pulls off like the one ZK listed.
Google shows a Dri-Lex company in South America, I haven't found anything else. I also have all the parts for a Royal, but have never put it together.

Almost identical to my Berg. Berg has an integrated shank and doesn't have the oilers, but otherwise...

 

[Mud]

Thanks, Berg is new to me.

 

[Dualkit]

I agonized over the choice several years ago to the point of delaying the purchase by at least a year. That was stupid. I ended up taking a chance on the Micron EME Smart Bar Puller and kicked myself for at least two years after for not purchasing it sooner. It has been FLAWLESS. Worth it's weight in Gold to me. Simple, but EXTREMELY and elegantly effective. I'd buy another today without hesitation if I had need.

What is the range on that puller? I didn't seem to turn it up on a quick browse.

 

[LOTT]

We have a set of Dunham cup type bar pullers, they came with a used lathe and work well, but they're kind of expensive for what they are. https://www.dunhamtool.com/bar-pullers/bar-pull-kits

I've also made pullers out of Delrin, boring them a bit under as noted in a previous post and slitting them on the band saw to flex a bit. I was having trouble with some large bar slipping once and stretched some O-rings around the outside of the homebrew Delrin puller, got the job done. They don't last forever and aren't something I'd use for production, but it's a handy technique to have.

 

[Spruewell]

The one mud showed is nice, but you have to be careful of the end of bar condition where it can pull that last bit of material out just past the collet, then slam it back into the face of the collet on the next cycle. You will want to make sure it has clearance in the puller jaws or accomidate this if possible. The arrangement shown by herding cats is not as problematic in this respect, but could have issues with the fingers flexing and not feeding consistently. A bar feeder is definitely worth the money in the long run as they tend to be quicker, more reliable, and have the added benefit of stabilizing the workpiece

 

[Cole2534]

I agonized over the choice several years ago to the point of delaying the purchase by at least a year. That was stupid. I ended up taking a chance on the Micron EME Smart Bar Puller and kicked myself for at least two years after for not purchasing it sooner. It has been FLAWLESS. Worth it's weight in Gold to me. Simple, but EXTREMELY and elegantly effective. I'd buy another today without hesitation if I had need.

I like this option. What sizes are you pulling with it? These would be 1-3/8" steel, 4 ft long. Roughly 20lbs max weight

 

[Mud]

The one mud showed is nice, but you have to be careful of the end of bar condition where it can pull that last bit of material out just past the collet, then slam it back into the face of the collet on the next cycle.

What happens if the Royal style grabs a bar end and the machine continues on?
We are careful about cycle counts and bar lengths. Another danger is having too little stock left in the collet to hold securely on the last part, so we err on the side of wasting a short length of material. With the one shown we have had the bar slip and not pull full length if the bar drags in the collet due to oversize or dirt. We also found that if the operator closes the 3J collet with no material in it, it springs the collet closed slightly and causes drag when open. Fixed that by spreading it back open slightly, it hasn't broken yet.

 

[Cole2534]

We do exactly that for a part from 1.125" hex steel, works great. Just a full depth notch in a piece of 1/8" CRS.

This is what I had in mind, bolt it to some 1" sq and stick it in the turret.