Honing cylinder

This topic has 3 replies, 3 voices, and was last updated 18 July 2026 at 22:37 by noel shelley.

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18 July 2026 at 18:04 #856679
Speedy Builder5
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@speedybuilder5
I am making a FarmBoy hit and miss engine and looking at the making of the combustion cylinder. This is about 3.5″ long and 1″ internal diameter (1.25″ OD) I intend to bore slightly undersized and then hone to size (leave piston manufacture until cylinder is honed).

Do I machine the cylinder and leave on the bar stock and hold the hone on the saddle tool post, or part off the cylinder and hold the hone in the chuck?

Questions:-

Should the hone be allowed to float if the cylinder is held by its bar stock ?

If cylinder parted off, could I hold the cylinder by hand or must it be fixed to the saddle cross slide?

Should the hone be held by the tail stock?

I intend making the hone to Ramon Wilson’s design.

What do you think ?

Bob
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18 July 2026 at 18:46 #856685
JasonB
Moderator
@jasonb
If it is the copper headed one to Ramon’s design then that is a lap and not a hone.

Have the lap being driven by the lathe or pillar drill and hold the (parted off) liner in your hand moving it up and down the lap as it turns.

https://www.modelenginemaker.com/index.php?topic=1908.0
18 July 2026 at 20:21 #856691
Speedy Builder5
Participant
@speedybuilder5
Thanks Jason, I found this link interesting:-

https://www.homemodelenginemachinist.com/threads/little-demon-v8-helpful-hints-hopefully.33799/page-4#post-435345

Bob
18 July 2026 at 22:37 #856717
noel shelley
Participant
@noelshelley55608
Hi Bob, If the cylinder is of the type where the head is separate then once bored to almost size I would hone using one of the commercially available 2 or 3 stone hones. Drive the hone with the lathe at slow speed (300 rpm) and hold the cylinder block in your hand. Lubricate with paraffin and try to protect the bed and lathe from the run off.

Once you are happy with the job then lap the piston to the bore, but remember that the piston depending on material may expands as it warms up and needs to be allowed for if it is to be a real “running engine “. Good luck. Noel.
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Honing cylinder

Honing cylinder

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