Biscuit jointing with limited clearance

[Corazones]

Can anyone please advise me?
My builder is about to add further lengths of engineered oak flooring to my existing, identical floor.
Because he cannot work entirely to the pre-machined tongue-and-groove ends, some lengths need to cut to size. Then, he intends to use a biscuit jointing technique in situ.
The problem is that there is insufficient bottom clearance to use a standard biscuit cutter; the flooring is 20mm thick on a concrete screed.
We realise that a lower bearing is advisable for accuracy and ease of working, but this adds so much to the depth. Is any type of cutter available with less than 10mm beyond the actual cutter? Or can anyone suggest a different technique?
Many thanks for your help,
Alec.

 

[foxhole]

Because he cannot work entirely to the pre-machined tongue-and-groove ends, some lengths need to cut to size. Then, he intends to use a biscuit jointing technique in situ.

Read more: //www.diynot.com/forums/woodwork/biscuit-jointing-with-limited-clearance.380319/#ixzz2iBX3bawe
Why?

 

[Dave54]

Thought I'd seen a top bearing slot cutter.
Axminster do one
http://www.axminster.co.uk/axcaliber-2-wing-slotting-router-cutters-prod809783/
You need the right cutter (4mm for biscuits it says there) and the arbor to suit.

 

[Corazones]

Because he cannot work entirely to the pre-machined tongue-and-groove ends, some lengths need to cut to size. Then, he intends to use a biscuit jointing technique in situ.

Read more: //www.diynot.com/forums/woodwork/biscuit-jointing-with-limited-clearance.380319/#ixzz2iBX3bawe
Why?

The reason is that the existing floor has fully glued tongues and grooves, so it is impossible to lift it all; in order to stagger the joints between new and old, some must be plain joints, hence the need for biscuit jointing here.

 

[Corazones]

Thought I'd seen a top bearing slot cutter.
Axminster do one
http://www.axminster.co.uk/axcaliber-2-wing-slotting-router-cutters-prod809783/
You need the right cutter (4mm for biscuits it says there) and the arbor to suit.

Many thanks, Dave. Half the problem is with the arbor, of course, and the one that Axminster illustrate seems to have overcome that issue as it is altogether shallower. Just the job!

 

[Corazones]

For the benefit of others who may be searching this topic in future, I have also received this helpful reply direct from Trend-uk:

Dear Alec

Thank you for your email, what you require is a slotting cutter as per the biscuit jointing cutter but with a flush bottom, so in this instance the bearing will be above the cutter not below.
You would need to purchase the items individually to make up the system you require.
The 3 different biscuit sizes take 3 slot sizes – 8.5mm for the (0) 10.5 for the (10) and 12.5 for the (20).
You will need to purchase the following items.

1 X Arbor (33/20X1/2)
1 X Slotter (34/11TC)
3 X Bearings (1 X B33 (8.5) 1 X B29 (10.5) 1 X B250 (12.5)

Please see links below showing these products from the Trend website.
I hope this information is of help to you ?

http://www.trend-uk.com/en/UK/product/33_20X1_2/4/108/arbor_for_m12_bore_groover.html
http://www.trend-uk.com/en/UK/product/34_11TC/4/107/slotter_4mm_kerf_m12mm_bore.html
http://www.trend-uk.com/en/UK/product/B33/4/148/bearing_33mm_diameter_12mm_bore.html
http://www.trend-uk.com/en/UK/product/B29/4/148/bearing_29mm_diameter_12mm_bore.html
http://www.trend-uk.com/en/UK/product/B250/4/148/bearing_25mm_diameter_12mm_bore.html

Regards
Dave Morris
Technical Support, Trend-uk.com