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Farm Machinery
Competition Ploughing
Counter sunk disc bolts
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<blockquote data-quote="Howard150" data-source="post: 4799296" data-attributes="member: 30002"><p>Nearly certain M8 are on mine. Make sure they are at least 10.9 (HT grade - not diameter) Might need to sharpen a masonry bit as you would an ordinary drill bit to countersink them though - unless you can get a carbide countersink. Disc should centre on the hub and bolts should pretty much self centre in the holes. </p><p>Lot easier than riveting. If you do decide to rivet with countersink rivets then locate the disc with bolts first. put all there rivets in the take one out and bolt it up tight. Then take another out and boltit up tight the same. Rivet the remaining one but whatever you do don’t use any heat whatsoever or you will distort the disc - even if you warm the rivet out of the hole. Best to be shy with the countersink then sand the proud bit off the top. Use a proper rivet snap to form the head on the boss. </p><p>Bolting is a lot easier. Trust me. Just in passing original rivets would probably have been 3/8”</p></blockquote><p></p>
[QUOTE="Howard150, post: 4799296, member: 30002"] Nearly certain M8 are on mine. Make sure they are at least 10.9 (HT grade - not diameter) Might need to sharpen a masonry bit as you would an ordinary drill bit to countersink them though - unless you can get a carbide countersink. Disc should centre on the hub and bolts should pretty much self centre in the holes. Lot easier than riveting. If you do decide to rivet with countersink rivets then locate the disc with bolts first. put all there rivets in the take one out and bolt it up tight. Then take another out and boltit up tight the same. Rivet the remaining one but whatever you do don’t use any heat whatsoever or you will distort the disc - even if you warm the rivet out of the hole. Best to be shy with the countersink then sand the proud bit off the top. Use a proper rivet snap to form the head on the boss. Bolting is a lot easier. Trust me. Just in passing original rivets would probably have been 3/8” [/QUOTE]
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Farm Machinery
Competition Ploughing
Counter sunk disc bolts
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