Buying a woodchipper / shredder

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Buying a woodchipper / shredder

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Andrea

Joined: 02 May 2005
Posts: 2260
Location: Portugal

Posted: Sat Sep 15, 12 3:02 pm Post subject: Buying a woodchipper / shredder
I'm looking to buy a second hand woodchipper / shredder. Has anyone heard of the brand UniTech? Apparently the one I'm looking at has a 9hp Briggs and Stratton Vanguard engine and will chip branches up to 9cm. Is there anything special I should be asking / considering? I can't find a match for the one I'm looking at on the net new.

Hairyloon

Joined: 20 Nov 2008
Posts: 15426
Location: Today I are mostly being in Yorkshire.

Posted: Sat Sep 15, 12 4:52 pm Post subject:
The name rings a bell, but I can't think where from. 9hp sounds sounds a sensible size for heavy domestic use.

Tavascarow

Joined: 06 Aug 2006
Posts: 8407
Location: South Cornwall

Posted: Sat Sep 15, 12 8:45 pm Post subject:
If you can, ask for a demonstration.

Ty Gwyn

Joined: 22 Sep 2010
Posts: 4613
Location: Lampeter

Posted: Sat Sep 15, 12 8:48 pm Post subject:
9cm thick branches ,seems a waste of good logs to chip.

Hairyloon

Joined: 20 Nov 2008
Posts: 15426
Location: Today I are mostly being in Yorkshire.

Posted: Sat Sep 15, 12 9:08 pm Post subject:

Ty Gwyn wrote:

9cm thick branches ,seems a waste of good logs to chip.

Yes. But it means it will chip big twigs at a sensible rate.
Anything smaller wouldn't.

Andrea

Joined: 02 May 2005
Posts: 2260
Location: Portugal

Posted: Sat Sep 15, 12 9:23 pm Post subject:

Hairyloon wrote:

Ty Gwyn wrote:

9cm thick branches ,seems a waste of good logs to chip.

Yes. But it means it will chip big twigs at a sensible rate.
Anything smaller wouldn't.

That's what I'm figuring. I'd imagine anything of 9cm would go on the firewood pile, but it means it wouldn't be working flat out to chip something smaller.

Hairyloon

Joined: 20 Nov 2008
Posts: 15426
Location: Today I are mostly being in Yorkshire.

Posted: Sat Sep 15, 12 10:04 pm Post subject:

Andrea wrote:

That's what I'm figuring. I'd imagine anything of 9cm would go on the firewood pile, but it means it wouldn't be working flat out to chip something smaller.

Consider the fractal nature of wood. When it splits, the smaller branches tend to have a similar total cross section, so if you cut the twiggy bit off the end of a 9cm stick and feed it to the chipper, then it is chipping something equivalent to a 9cm stick.

But the line at the bottom is rate of work. A 9cm chipper chips a 3cm stick a lot quicker than a 5cm chipper.

Bodger

Joined: 23 May 2006
Posts: 13524

Posted: Wed Sep 19, 12 9:13 am Post subject:
We checked the 'Which' website and settled for one that they recommended. A couple of weeks ago, we bought a Bosch AXT 25 D. It performed admirably over the the weekend.

Andrea

Joined: 02 May 2005
Posts: 2260
Location: Portugal

Posted: Wed Sep 19, 12 11:48 am Post subject:
We're probably having to pay about 5 times that, second hand, for the machine we're looking at. Still pondering.

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