This blog although factual is technically incorrect see Yonico Router bits Technical information
Somebody really goofed with these, apart from the sucker who bought them.
I saw these on ebay
I have some Yonico bits so I was not too concerned, but I should have been starting from the heading.
5x Rail & stile half round, I am not sure how you would use them for Rail & Stile work however the are certainly half round.
Somebody has corrected the heading later in the body of the advertisment to:-
Half round bull nose Set.
The “Set” comes in five individual containers, as shown in the supporting photos
All the containers have no markings whatsoever displayed on them so I set about measuring them so I could mark the containers.
I should never have done that!
I made a total of six measurements, A the shank. B the bearing. C the top edge of the cutter. D1 and D2 the distance of each half round sections, and E the bottom edge of the cutter.
This is what I found,
Apart from the advert stating diameter sizes in two places the sizes are actually the radius measurements.
Secondly there is a variation in the measurements of at least 3mm in Dimension C and dimension E considering they, (in my mind) should be parallel not having a difference of about 3mm its very poor workmanship.
Now looking at the second picture
The shank is shown to be 1.1cm or 7/16 not half an inch thankfully its wrong also.
In my measurements on the left is their reported dimensions (2cm to 3.5cm) on top of each bit Of which I an not really concered as to their width but again would assume both should be at least parallel to each other.
See the refelected actual measurenets in Columns C and E.
The D1 D2 measurements should be 19.05,15.8, 12.7. 9.5. and 6.35
the 2.2cm or 3/8 should be 9.5225mm not 8mm otherwise its a ring in!
I am sure somebody has made some real klinkers here or am I just too fussy?
Some return correspondance
An up date, I would have thought the 1.1 would be explained away as a typo too,
received a email back saying 1.1cm is 1/2”
from memory 1.1cm is
0.437 expressed as a decimal or
7/16 expressed as afraction or
11.112 if expressed as mm
I also checked one of the other Yonico Bullnose bits I have
So confirming the two surfaces are in fact parallel I checked some other non Yonico bulllnose bits still the same parallel surfaces C and E.
So I sent off another email asking about the 8mm as opposed to 9.5mm?
I dont hold too higher expectations as to getting some factual replies but will keep you posted.
-- Regards Robert