Camel(fish)back straight edge

[Brad93]

I’d bring you a piece of Concast or some
Off cuts back but they’re 27 tonne slabs 10” thick.

 

[pressbrake1]

I gotta get a dovetail model of 32", I guess I could use a 30. It's for scraping my cylindrical grinder. Only trouble is I'm not sure I have any good way to hold the thin table without it bending under it's own weight. I guess I could support it at about 25% in from each end.

Oh no a excuse to make a pattern for a 36” camelback

 

[Brad93]

The offcuts probably weigh as much as a small car

 

[pressbrake1]

I gotta get a dovetail model of 32", I guess I could use a 30. It's for scraping my cylindrical grinder. Only trouble is I'm not sure I have any good way to hold the thin table without it bending under it's own weight. I guess I could support it at about 25% in from each end.

If there’s a good area to clock I’d put it on a surface plate and experiment moving support s to find the airy points.
From my work on grinders bed wear on the dovetail where the tailstock slides can be more of a pita than way wear with every different length job needing clocking in and correcting

 

[pressbrake1]

Chomping on the Rockford

 

[Maker]

Are those drilled angle plates the 150mm angle iron you were looking for the other week?

 

[Brad93]

Wonder how flat it comes off the shaper. Far better than off a mill I imagine.

 

[brightspark]

Wonder how flat it comes off the shaper. Far better than off a mill I imagine.

whys that .if it were the case they would still be in service in most machine shops

 

[pressbrake1]

Wonder how flat it comes off the shaper. Far better than off a mill I imagine.

Yes much better
Grade B surface plates and straight edges are planed

 

[pressbrake1]

whys that .if it were the case they would still be in service in most machine shops

perhaps @Pete. will explain. I don’t have the stamina to explain

 

[brightspark]

perhaps @Pete. will explain. I don’t have the stamina to explain

was talking about a shaper not a planer .the planer is more accurate and can handle a lot larger stuff https://machineryfuture.weebly.com/knowledge/shapers-and-planers-01

 

[Brad93]

perhaps @Pete. will explain. I don’t have the stamina to explain

@brightspark
Single point tool always makes a surface flatter.

Today’s world of speed and efficiency doesn’t allow for machines like planers, shapers etc.

Labour intensive, power hungry and the requirement for highly skilled knowledgable operators like @pressbrake1.

 

[Pete.]

A milling cutter is a rotating tool that inherently has an interrupted cutting action, or at least variable loadings. The planer uses a static tool and a steady, constant cut. Aside from that there is the matter of sheer mass and surface contact/weight distribution. The planer table rides on a huge surface where it's supported most of it's length, and has large mass. Just the clamping arrangement in the photo above weighs more than your average small milling table.

Why doesn't every machine shop have one? They are huge, and slow, and specialised in use. We no longer have the industry in the country that requires the common use of such machines.

 

[brightspark]

A milling cutter is a rotating tool that inherently has an interrupted cutting action, or at least variable loadings. The planer uses a static tool and a steady, constant cut. Aside from that there is the matter of sheer mass and surface contact/weight distribution. The planer table rides on a huge surface where it's supported most of it's length, and has large mass. Just the clamping arrangement in the photo above weighs more than your average small milling table.

Why doesn't every machine shop have one? They are huge, and slow, and specialised in use. We no longer have the industry in the country that requires the common use of such machines.

that is true but a shaper doesn't and isn't as accurate

 

[pressbrake1]

Planers aren’t obsolete, the work has gone off shore.

 

[pressbrake1]

that is true but a shaper doesn't and isn't as accurate

My butler toolroom shaper is dead bang accurate though a shaper won’t stay accurate as long as a planer will

 

[pressbrake1]

A mill has to have perfect geometry in all axis and perfect bearings to produce flatish work
Single point only needs accuracy in two plains just like a surface grinder

 

[Pete.]

Planers aren’t obsolete, the work has gone off shore.

I wasn't suggesting it, just that they aren't used much in the UK. Space is at a premium and wages are too high to make them pay. I only know of one apart from yours that's in constant use. I'm sure there must be more but I bet there aren't too many.

that is true but a shaper doesn't and isn't as accurate

Shapers have very little way bearing compared to the travel, the ways work much harder than planers. They also have the disadvantage of a bloody great overhanging lump on the front, albeit with a support but they still aren't ideal. Planer table is fully supported.

 

[pressbrake1]

This is one of my butler shapers, not a tool room like my 18”
It stands 6’ tall at the compound handle has powered compound slide and tool lift. 26” stroke and around 5ton

 

[pressbrake1]

Beware cheesy rock music