Quantcast
  • We invite you to join UKWorkshop.
    Members can turn off viewing Ads!

Biscuit joining question.

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

archpa

Established Member
Joined
21 Apr 2004
Messages
53
Reaction score
0
Location
Hertford
Hi,

I have recently bought a biscuit cutter for my router and tried out a test joint. The slot seems to big for the biscuit, and I was wondering if that's normal, or if my cutter is too wide, or the biscuits unusually thin...

Slot created by cutter: 4.3mm
Biscuit thickness 3.5mm

That's nearly 1mm gap! I know they are supposed to expand, but surly not that much. So which is it? the biscuit or the cutter?

I also measure the cutter blade and it's 3.9mm. Is it surprising that the resultant slot is 4.3mm in pine? Could the cutters be out of alignment and causing it to cut .4mm wider than one cutter? (It is a cheap cutter, I have to confess) :oops:

Cheers

Paul
 

Philly

Established Member
Joined
24 Nov 2003
Messages
6,874
Reaction score
0
Location
Dorset, England.
Paul
They should be a reasonably snug fit in the slots-sounds like maybe the bit is out of true....My cheap ferm biscuit jointer used to do the same. I finally coughed up for a Lamello and finally I get slots that are "right"-when you watch Norm using biscuits he always has a hammer to hand to tap them in and get the joint together!
Maybe you should return the bit?
Hope this helps
Philly :D
 

Neil

Established Member
Joined
7 Oct 2003
Messages
1,016
Reaction score
0
Location
Ireland
Paul,

A couple of weeks back, Noely and I did a side-by-side comparison between his superb Porter-Cable (much better than Philly's Lamello :p) and my cheap Ferm - the slots cut by the PC measured 4mm, and the Ferm 4.1mm. My biscuits were a tight, snug fit in the 4mm slots, so I would say that the biscuits must measure close to 4mm themselves, yours maybe sound a bit thinner than I would have expected? :? Maybe mine are a bit swollen, but if so I can't understand why the PC would be set up to cut 4mm slots...

4.3mm sounds too big anyway, just the extra 0.1mm slop in the slots from my Ferm results in noticable 'biscuit wobble'

Cheers,
Neil

<edited for typos :roll:>
 

archpa

Established Member
Joined
21 Apr 2004
Messages
53
Reaction score
0
Location
Hertford
Neil,

Thanks for that - that's very interesting. So it sounds like I need to get a new cutter and a new set of biscuits!
 

jasonB

Established Member
Joined
26 Nov 2004
Messages
5,044
Reaction score
0
Location
Surrey
The size of the biscuit determines the depth of cut, they all fit a nominal 4mm slot but if the router cutter is running out then if using No20's the wobble will be greater.

How thick is the timber, if the arbour is a long way out of the collet to set the slot into thick timber this will also cause more wobble.

Jason
 
A

Anonymous

Guest
Paul

I found exactly this about 4 years ago. I bought a Trend cutter and the biscuits were very loose in the slots. I used a stone to reduce the thickness of the slot by working the edges of the TC teeth. Never got to be as good as I wanted

With my Freud biscuit jointer, there is a no slop at all:)
 

Argee

Established Member
Joined
2 Feb 2005
Messages
1,501
Reaction score
12
Location
Crowborough, East Sussex
Standard cutters are 4mm. Biscuits are supposed to be an interference fit in that slot, but some poor quality versions are just rubbish - no consistency in size or quality.

Cutting with a biscuit jointer makes it easy to cut perpendicular to the edge, providing the fence is robust and the cutter is used with a firm, steadying grip.

Using a router-mounted cutter, it is not anywhere near as easy to get a perpendicular cut - the slightest rocking motion (not easy to spot, never mind control) will lead to an oversize slot.

Run-out is a possibility, however unlikely. Nothing beats a Lamello.

Ray.
 

devonwoody

Established Member
Joined
11 Apr 2004
Messages
13,468
Reaction score
7
Location
Paignton Devon
Stick two biscuits together and then sand them down to the correct thickness :lol:

Only trying to help :x
 
A

Anonymous

Guest
Do they have to be the same sort or can you use a bourbon and a custard cream?
 

Dewy

Established Member
Joined
11 Jan 2004
Messages
602
Reaction score
0
Location
Gloucester
I bought a cheap Ferm one from Screwfix and had problems to start until I got used to holding it correctly.
I had just been holding the tool with one hand which meant it was not always firmly down and then the slot was widening as I pulled it out.
Since keeping my left thi=umb firmly down on the fence the slots improved no end.
 

Bean

Established Member
Joined
12 Jan 2004
Messages
1,518
Reaction score
0
Location
scouting about
Do they have to be the same sort or can you use a bourbon and a custard cream?
I believ you can, But under no circumstances must you join Hobnobs to rich teas for the obvoius reasons

Bean
 

Dr. Thrax

Established Member
Joined
1 Feb 2004
Messages
133
Reaction score
0
So what make of biscuits (Non-edible :D ) does everyone recommend ?
 

gwaithcoed

Established Member
Joined
23 Feb 2005
Messages
795
Reaction score
38
Location
North Wales
So what make of biscuits (Non-edible ) does everyone recommend
Tanseli,Lamello, Freud, Trend, I've used them all at some time, never had any problems, main thing is to always keep them in sealed packs. I keep mine in the cupboard where the gas boiler is sited

Cheers Alan
 

Bean

Established Member
Joined
12 Jan 2004
Messages
1,518
Reaction score
0
Location
scouting about
Now then SP I have an axminster and some Tanseli biccies, I have almost always got a loose fit with an oversize slot. I have put this down to technique and or run out on the BJ. Have you ever measured the run out??

Bean
 

llangatwgnedd

Established Member
Joined
17 Sep 2002
Messages
1,087
Reaction score
14
Location
Castell Nedd, De Cymru
HI Bean
I get a nice push fit with mine and even on a a dry assembly not one biscuit falls out.

How do I go about measuring the run out ?
 

Bean

Established Member
Joined
12 Jan 2004
Messages
1,518
Reaction score
0
Location
scouting about
I'm thinking of using a DTI on the blade tips, with the BJ clamped to the bench.
I will have a play later and see what I get.

Bean
 
A

Anonymous

Guest
Used to buy 100 pack at £4.95 but have now found that Trend now do a 1000 pack for £22.00. That`s what I call a Saving !!
 
Top