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Brushcutter heads...
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Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Mon Aug 24, 15 11:59 pm    Post subject: Brushcutter heads...  Reply with quote    

These seem to come with anything from 3 to 40 tooth blades. What's the advantages of which?

I've also heard of a chain based head, though I have heard it has been outlawed: anyone know about that kind of thing?

dpack



Joined: 02 Jul 2005
Posts: 32778
Location: yes
PostPosted: Tue Aug 25, 15 12:15 am    Post subject: Reply with quote    

iirc bits can fly off chain ones in a ballistic manner which could be unpleasant if they go in a bad direction.if they are banned that is probably a good thing

as to how many "teeth" iirc it is a matter of getting the right sort for the type of brush to be cut which should be mentioned in the sales spec.

spose it is a bit like chainsaw chains and bars or disc cutter disks,different ones are best for different jobs

dpack



Joined: 02 Jul 2005
Posts: 32778
Location: yes
PostPosted: Tue Aug 25, 15 12:16 am    Post subject: Reply with quote    

ed culled for double post

Last edited by dpack on Tue Aug 25, 15 9:42 am; edited 1 time in total

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Aug 25, 15 12:23 am    Post subject: Reply with quote    

Mostly it is for bramble, with a certain amount of sticks in it.
The cord did fairly well on it, but it was eating the cord at an excessive rate.

Mistress Rose



Joined: 21 Jul 2011
Posts: 8610

PostPosted: Tue Aug 25, 15 6:45 am    Post subject: Reply with quote    

The chain ones were ideal for brambles, but as Dpack says they have been banned. Sadly, a man died as the result of an accident with a very badly maintained one and working in an unsafe manner. Unfortunately HSE considered that brush cutters were not designed to be used with them, and has not revisited rules about their use, but just banned them.

The best thing we find for brambles is a straight blade with turned down ends. Not sure if they would be available for domestic strimmers, but we use them for bramble clearance on the professional brush cutters.

SteveP



Joined: 23 Jan 2008
Posts: 155
Location: North Devon
PostPosted: Tue Aug 25, 15 7:55 am    Post subject: Reply with quote    

Is this any help?

http://www.stihl.co.uk/STIHL-Products/Grass-Trimmers-Brushcutters-and-Clearing-Saws/0281/Cutting-tools.aspx

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Aug 25, 15 8:55 am    Post subject: Reply with quote    

Mistress Rose wrote:
The chain ones were ideal for brambles, but as Dpack says they have been banned. Sadly, a man died as the result of an accident with a very badly maintained one and working in an unsafe manner. Unfortunately HSE considered that brush cutters were not designed to be used with them, and has not revisited rules about their use, but just banned them.

I've already told HSE to take a running jump over top-handled chainsaws, so they can get stuffed over brushcutters also, especially now I know that the fatality was down to bad practice.

Any clues where I can get one?

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Aug 25, 15 8:57 am    Post subject: Reply with quote    

SteveP wrote:
Is this any help?

http://www.stihl.co.uk/STIHL-Products/Grass-Trimmers-Brushcutters-and-Clearing-Saws/0281/Cutting-tools.aspx


A little. Thank you.

Tavascarow



Joined: 06 Aug 2006
Posts: 8399
Location: South Cornwall
PostPosted: Tue Aug 25, 15 9:09 am    Post subject: Reply with quote    

If it's just for brambles & small saplings the three or four blade head is more than adequate.
I use nylon mostly because even the blades can shatter & become ballistic if you hit a stone.
Thicker nylon lasts longer. I think I'm using 3mm which smashes all but the biggest woody brambles with ease.

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Aug 25, 15 9:43 am    Post subject: Reply with quote    

Tavascarow wrote:
If it's just for brambles & small saplings the three or four blade head is more than adequate.
I use nylon mostly because even the blades can shatter & become ballistic if you hit a stone.

If you've got the guard on then you should be safe from ballistic action and if there is nobody else in range, then their safety is not your problem.
I liked the nylon because it has a bigger cut than the blade so it's quicker, but as I said, my brambles were eating it... some of that could've been user error I suppose.
Quote:
Thicker nylon lasts longer. I think I'm using 3mm which smashes all but the biggest woody brambles with ease.

I forget how thick it was, 'twas a borrowed machine, I think it was 4mm.

RichardW



Joined: 24 Aug 2006
Posts: 8414
Location: Llyn Peninsular North Wales
PostPosted: Tue Aug 25, 15 3:53 pm    Post subject: Reply with quote    

If it was eating 4mm fast either is was cheap crap, old stock or as you said user error.

Possibly the brass eyes are word & damaging the cord.

Is the cord snapping at the head or are you having to manually / bump feed it often?

Some auto feed at max revs so if your holding it on the limiter then that will also explain the fast usage.

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Aug 25, 15 4:14 pm    Post subject: Reply with quote    

RichardW wrote:
If it was eating 4mm fast either is was cheap crap, old stock or as you said user error.

I'm fairly sure it was good cord.

Quote:
Is the cord snapping at the head or are you having to manually / bump feed it often?

A bit of both.

Mistress Rose



Joined: 21 Jul 2011
Posts: 8610

PostPosted: Wed Aug 26, 15 6:09 am    Post subject: Reply with quote    

No, I am afraid you can't buy the chain ones as it is illegal to sell them.

It will depend on the brambles you are cutting. If they are fairly thin then the cord might do it, but if they are really thick and include dead ones, the cutter I described will work best.

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Wed Aug 26, 15 10:09 am    Post subject: Reply with quote    

Mistress Rose wrote:
No, I am afraid you can't buy the chain ones as it is illegal to sell them.

I don't believe that is a world-wide ban. Nor can it be a particularly complicated mechanism, and I know a good engineer.

Assuming that we have dismissed the ban as the over-reaction of a bunch of desk jockeys, then the relevant question is: how good are they?

Hairyloon



Joined: 20 Nov 2008
Posts: 14707
Location: Today I are mostly being in Yorkshire.
PostPosted: Wed Aug 26, 15 2:26 pm    Post subject: Reply with quote    

Another point: what size line do you want for what power engine?
Or do I mean that question the other way about?
I was looking at a 3hp strimmer which I thought was probably meaty enough, but it comes loaded with 2.5mm line, which seems rather lightweight.

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