Removable pinch roller

[Thrashsmith]

Hello all, on my sheet metal pinch rollers the bottom pinch roller is removable, similar to this Edwards one I've pulled off Google.
Why? It doesn't help for getting a cylinder off the rolls. Or am I being thick?
Thanks

 

[Beanwood]

Perhaps so a shaped roller can replace it, for reducing wire diameter or something?

 

[bricol]

Removeable as a happy coincidence of being able to skew it for rolling tapered cones?

 

[tigdlo]

Llift the rear roller, not visible in the photo, and the workpiece will roll around the romovable roller in the empty space in the front of the frame.

 

[Thrashsmith]

Maybe I should have clarified that the roller isn't totally removable, it can disengage & then can be swung out at an angle to rest into the cradling bracket, which can be see on the left hand side, on the vertical frame.

 

[tigdlo]

Maybe I should have clarified that the roller isn't totally removable, it can disengage & then can be swung out at an angle to rest into the cradling bracket, which can be see on the left hand side, on the vertical frame.

Enough to slide off a tightly rolled cylinder?

 

[Thrashsmith]

Enough to slide off a tightly rolled cylinder?

No because it'd still be trapped between the top pinch roller and the former roller (not visible in the pic)

 

[tigdlo]

former roller (not visible in the pic)

How high can that be adjusted? I really cant see why you can't roll the workpiece around the removable roller, there appears to be plenty of vertical adjustment on that roller.

 

[Richiew]

I think it was mentioned earlier. Bend down and around the bottom roller rather than up. The rear roller needs raising above the middle and then you set the bend by tightening it down. The roll should form around the bottom roller.

 

[Thrashsmith]

Here's a couple images of mine. There's bracing bars underneath which would obstruct things from being rolled downwards. I get the rationale behind thinking it should be rolled down, but I just don't think it works in practice....?

 

[Thrashsmith]

Just pulled this image off eBay of another pinch roller where it's in the more usual format of having a removable top roll

 

[tigdlo]

There's bracing bars underneath which would obstruct things from being rolled downwards

You wouldn't roll anything that large underneath, anything with a large enough radius is elastic enough to be opened up to remove it without permenantly bending it. There isn't a front brace which is another reason I'm sure my thinking is correct.

I get the rationale behind thinking it should be rolled down, but I just don't think it works in practice....?

Try it.

Perhaps a casting is stiffer and allows it, maybe a removable lower roller was required to make it fabricated.

 

[bricol]

Earlier example:

M

Thread 'Bending/slip rolls what am I going to do wrong?'

Mar 26, 2024

I’ve been very fortunate to have some slip rolls land in my lap. I haven’t really got a clue how to use them properly.

They are (I assume) fairly old with ‘buck and Hickman London’ cast on the legs and are about 3 feet wide and unlikely to blow away.

They seem like a fairly straightforward/foolproof piece of equipment, but in my hands all bets are off!
So is there anything I should watch out for when having a go?

First thing that I’m not sure of is which way the back roller works. Most I’ve seen seem to pull the work up, but these seem to have a bar across the back that looks like it...

• Martin Hocking
• Replies: 9
• forum: Metal Forming

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