Farmerpickle
Member
Good afternoon all,
Would anybody know if there is such as thing as there being an easy way to countersink disc bolts?
Would anybody know if there is such as thing as there being an easy way to countersink disc bolts?
Countersinking disc bolts
- Thread starter Farmerpickle
- Start date
- Location
- 200 miles N,NW of New York
slow geared pillow drill, Mason Master drill bit, slow speed plenty of lub
- Location
- Cirencester
You can get countersink bits for Mag drills if you've got one, not used one for discs mind.
Mydexta
Member
- Location
- Dundee/angus
Because the discs are so thin, do you have to also countersink the hub??
- Location
- Cirencester
I guess it would depend on what countersink angle you get on your bolts, 82 and 90 are common but you can get 100-120 degree which would give you a much larger surface area so a thin'ish disc wouldnt be a problem.
I use an SDS masonry bit 20mm ground to 60 degrees with a cutting edge, Use a diamond wheel to grind, lube well and don`t use too much pressure. This is for M10 screws. Countersink the hub as Mydexta says otherwise the screws will bottom and the disc will work loose,
M8’s work fine, are strong enough and self centre without having to touch the hub. Don’t forget, 3 hole Ransomes discs locate on the hub. The disc is only subject to turning forces. Make sure the bolts are 8.8’s or 10.9’s. 60 degree will be fine. As Bob so rightly says, if you can’t get a hardened or tungsten countersink then sharpen a masonry bit accordingly.
Mydexta
Member
- Location
- Dundee/angus
Hope you’re not on commission @Howard150
Are they Ransomes hubs? Can countersink discs be done to Kverneland 3 hole disc.
Need to get a bit back for all these legs I am machining!
Genuine Ransomes hubs bushes and sleeves have not been available for a long long time.
You can countersink everything known to mankind one way or another.......as long as you have the right countersink bit for the job in hand! Yes in a word.
Farmerpickle
Member
I'm struggling to countersink them. The disc steel instantly takes the edge off the drill bit. Plan B, SDS masonry bit. Would one of these be suitable for the job? https://www.ebay.co.uk/itm/Bosch-Pr...802603?hash=item420d1c56eb:g:dmgAAOSw6yxd269H
Bob put a post on earlier. Sharpen a masonry bit up as you would an ordinary drill bit. use M8’s as it’s a lot less work and you might well get away without countersinking the hub. ......and do it s l o w l y!
- Location
- East Sussex
Can you drill them with a bolt or get them hot and soft in a specific area for drilling? Perhaps it would ruin the disc.
Counter sinking the hub might not need to be done as I see in an image above a round of plastic is used as a spacer, something like the side cut out of a plastic oil can.
Counter sinking the hub might not need to be done as I see in an image above a round of plastic is used as a spacer, something like the side cut out of a plastic oil can.
Farmerpickle
Member
That is plan B. I have also heard that the SDS masonry bits are made of harder steel, so it will interesting to see.
Any masonry bit will do. It’s the tungsten tip which is the clincher!
Farmerpickle
Member
@Howard150 @arcobob
Just wanted to know what pillar drill do you have? I’m struggling to get a pillar drill that is out far enough to do a 18” disc.
Just wanted to know what pillar drill do you have? I’m struggling to get a pillar drill that is out far enough to do a 18” disc.
A large floor standing one but not sure of the make
- Tags
- disc drills kverneland tungsten