BSA Main Bearing Bush Hone

[@fredblogsmac.5697]

there used to be a foundry next to my school as a boy, these vids bring back memories of standing in the door watching the machine working

[@AGEngineering]

You'll like the upcoming video then 😉

[@retromechanicalengineer]

Ade is back and all is well with the world! Great video, love the honing machine. Good to see you back, hope all is well with you. Dean in Oxfordshire.

[@AGEngineering]

I'm good thanks, thought it would be good to show something a bit different for a change

[@retromechanicalengineer]

Hello Ade, hope you and the family are well. I have a honing/boring question. Can I contact you by email? Cheers, Dean.

[@lydwood]

Very good these delapena machines, I've had one for 15 yrs. They are excellent at removing taper and ovality from a bore. People don't realise that even a toolroom lathe will not produce a perfect bore but the delapena or sunnen equivalent sorts it very quickly. You'd find it easier to switch the dial indicator on your bore gauge for one which reads in tenths of a thou, you can see what's going on much better then.

[@AGEngineering]

Thanks for watching and commenting, always appreciated

[@pnuts1649]

Nice honing machine and nice work bringing back into service. Thanks for the video.

[@AGEngineering]

Thank you very much!

[@britishreaction54]

Great to see you back Ade. A very interesting video about a little seen but fascinating machine. I'm looking forward to seeing how you did with the other engine. Particularly building up the crank.

[@AGEngineering]

It's sunny today, I may be able to progress 😉

[@britishreaction54]

@@AGEngineering I hope you do get some done. It's pouring with rain here in the Highlands.

[@roadracejoe]

Tatro Machine uses a similar honing machine, welcome back Ade 👍

[@AGEngineering]

I've just taken a look at his channel cheers for the info, regards, Ade

[@stephenwilliams926]

I use one of these at work a bit newer than this model circa 1983 with front carriage guide rail's to hold the job a lot safer.

[@AGEngineering]

Guide rails would be useful for sure, thanks for watching

[@secretsix6]

i you have the machine that goes ping somewhere in that garage

[@AGEngineering]

Erm, I'm still working on a reply..

[@oompah_your_dupa]

Thanks for the video! Any idea on the longevity of this type of bush honing? I have an A50 engine that will need a timing side bush and almost everyone says “it needs to be line honed with the cases bolted together! Otherwise it won’t be straight!” That made sense to me until I read a comment stating that’s not true because there’s .002” clearance between the alignment dowels for the case halves anyway. So as soon as you unbolt the cases after line honing, there’s no guarantee they’ll align the exact same way again for final engine assembly. So it seems that an adjustable hone in a milling machine would do just fine. Thoughts?

[@AGEngineering]

Thanks for the comments. Longevity - honing is in the superfinishing class of machining operations, accurately sized, a honed bore far exceeds reaming or boring in terms of life. Line honing more applies to 2 or more bushes on a common centre line than the bsa engine with a bearing and bush set up. Honing only follows the existing bore and will correct out of round, barrelling, taper etc and gives excellent surface finish and accurate sizing, it can take off larger amounts but is more aimed at removing a few tenths of a thou than a few thou, depending on stones, feed, pressure etc. The stones in the mandrel I used are around equivalent to #500 grit maybe. A fixed head, micrometer adjustable hone in a milling machine would be similar to a vertical hone, but not one of the spring 3 leg cylinder type, too difficult on such a small bore.

[@oldschoolengineer58]

good video Ade, Thanks for sharing

[@AGEngineering]

Many thanks Roy

[@nigeljohnson505]

Thanks Ade, I enjoyed that.

[@AGEngineering]

Thanks for watching

[@Robonthemoor]

Posh bit of kit 😀

[@AGEngineering]

It's in a bit better nick than when I bought it that's for sure

[@alanwinter3316]

What a waste of time that honeing machine is. The Bush could never be spot on because its wobbling about all over the place with you holding it. It needs to be put on a milling machine table and centerd then bolted down. Then bored with a boring bar parallel. I would have that job finished in quarter of the time you took fiddling about. I actually i dosed off watching it because it took you that long. Sorry if this comment upsets you.

[@AGEngineering]

No problem at all. Look for my BSA A group bush fitting video, using a milling machine as you suggest. As I mentioned we are taking off a few tenths of a thousandth of an inch here, on the high spots only, the hone follows the bore with almost zero pressure. It would take a very long time to remove a couple of thou by this method, this example was a good opportunity to show other methods than boring on a mill, honing also gives a much better surface finish which when done after boring will give a long bush life. Thanks for watching and commenting.

[@retromechanicalengineer]

I imagine that's why BSA, Triumph and many other motor manufacturers had Delapena honing machines in their factories, just to waste a bit of time.

[@piearm1271]

A G Engineering excellent response, it does surprise me when people misunderstand the honing process and compare it to machining. As you made clear in the start the bush is slightly out of round so honing is the sensible process.

[@AGEngineering]

Many thanks for your comment, appreciated