Bandsaw cutting

[choco]

Anyone have any idea why the cuts are coming out like this in the pics i tried adjusting everything. It starts fine but half way through the cut it pushes the blade outward from the vice. It's a holzmann 128 bandsaw more or less the same as all the other 6x4 Chinese machines but the head swivels.

 

[brightspark]

blade shoving down 2 hard if everythings in line. or not enough tension . or guides arent close enough to the material

 

[Shedendman]

Plus it depends what blade you have,coarse,fine,is it for metal etc etc?

 

[Erie Fred]

Dull blade as well.

 

[choco]

I'll try a new blade , I bought it second hand. I tried brass, aluminium, steel all the same cut. Stainless was very bad. What tpi do ye recommend for stainless exhaust ? 75mm D 1.5mm wall
I'll have to look at the down feed cylinder aswell as it's jerky not smooth. I have to keep adjusting the pressure during the cut

Blade is a fine blade

 

[Erie Fred]

I'll try a new blade , I bought it second hand. I tried brass, aluminium, steel all the same cut. Stainless was very bad. What tpi do ye recommend for stainless exhaust ? 75mm D 1.5mm wall
I'll have to look at the down feed cylinder aswell as it's jerky not smooth. I have to keep adjusting the pressure during the cut

TPI is minimum 3 teeth in the cut. IIRC max. 6 teeth.

However don't think finer is better, teeth will clog and then blade skates (which it looks like yours is doing based on the fine chips)

Also, SS will work harden if you rub and don't cut.

 

[Shedendman]

this one?

Holzmann BS128HDR Metal Bandsaw | NMA Tools

The Holzmann BS128HDR heavy duty metal cutting bandsaw is the ideal machine for cutting pipework, box section steel, and a variety of other workshop tasks. blade dimension: 1638x13x0,6mm swiveling cutting head features automatic shut-off function solid grey cast iron machine with ball...

nmatools.co.uk

3 speeds,what speed you using?

 

[choco]

this one?

Holzmann BS128HDR Metal Bandsaw | NMA Tools

The Holzmann BS128HDR heavy duty metal cutting bandsaw is the ideal machine for cutting pipework, box section steel, and a variety of other workshop tasks. blade dimension: 1638x13x0,6mm swiveling cutting head features automatic shut-off function solid grey cast iron machine with ball...

nmatools.co.uk

3 speeds,what speed you using?

That's the one, middle speed. It's supposed to be high speed for aluminium brass etc

 

[Erie Fred]

That's the one, middle speed. It's supposed to be high speed for aluminium brass etc

But not SS.

 

[choco]

But not SS.

Ya Slowest for SS, I had it on middle

 

[choco]

Is 14tpi ok for SS pipe and general cutting? I'll order a new blade now.

 

[Erie Fred]

Is 14tpi ok for SS pipe and general cutting? I'll order a new blade now.

What thickness ?

 

[choco]

What thickness ?

1.5mm wall 75mm Dia

 

[Windy Miller]

Hmmm watching this with interest. I have a similar saw with a similar problem!

 

[Turbo]

Been covered on the forum before several times.
Search for 6x4 bandsaw.

It's all about setup, a new blade and correct feed rate.
Fitting a adjustable motorcycle steering damper to control the feed really helps.

 

[frank horton]

I use Cobalt HSS vari tooth blades from TUFSAW, ex quality and a good price....
there was 3 diff tooth counts on those blade and a chart to help u choose.....
My blade have been well used and still good......sometime have cut road spring and still eats up mild steel....but my saw has coolant.....
my gen cutting jobs are 100x50x3mm box and 200x8 or 10mm plate.....the blade thats on now has just cut enough steel for a 160sq,m barn and its 5 years old....
Unless u break it, it will last for years.....
HSS blade dont last that long in comparison....and I'm lazy, sooner do something else than keep changing blades...
Unless ur desperate, blades from the likes of Machine Mart etc are carp.....and only pennies cheaper than proper makes like Sandvik etc if u check around....

 

[choco]

Been covered on the forum before several times.
Search for 6x4 bandsaw.

It's all about setup, a new blade and correct feed rate.
Fitting a adjustable motorcycle steering damper to control the feed really helps.

It's setup correct , it has a hydraulic cylinder , so that leaves the Feed and new blade. Thanks I'll search 6x4

 

[choco]

I use Cobalt HSS vari tooth blades from TUFSAW, ex quality and a good price....
there was 3 diff tooth counts on those blade and a chart to help u choose.....
My blade have been well used and still good......sometime have cut road spring and still eats up mild steel....but my saw has coolant.....
my gen cutting jobs are 100x50x3mm box and 200x8 or 10mm plate.....the blade thats on now has just cut enough steel for a 160sq,m barn and its 5 years old....
Unless u break it, it will last for years.....
HSS blade dont last that long in comparison....and I'm lazy, sooner do something else than keep changing blades...
Unless ur desperate, blades from the likes of Machine Mart etc are carp.....and only pennies cheaper than proper makes like Sandvik etc if u check around....

Thank you, I'm in the south of Ireland so they won't ship to me. Iv found a bi metal hss vari pitch 10/14tpi from the Mr. bandsaw on Amazon. I'll give that a go