The Steamboating Forum

Posted: **Tue Feb 10, 2026 7:50 pm**

Hi,

the work is done, all parts are finished.

As is so often the case, mechanical engineering begins with the construction of fixtures and fittings to enable the necessary work to be carried out. Here are the mounting pins for the lever. This allows the lever's radii to be milled very conveniently using a rotary table.

: The mounting pins for milling the lever; STUART_MembPu076klk.jpg (112.42 KiB) Viewed 236 times

The drive lever is fixed to the axle using an M3 threaded stud. The bearing bushings in the diaphragm rod are IGUS sleeve bearings.

: the individual parts of the drive; STUART_MembPu073kl.jpg (137.82 KiB) Viewed 236 times

: The lower part of the pump with the individual parts of the drive; STUART_MembPu075kl.jpg (109.6 KiB) Viewed 236 times

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Dietrich

Posted: **Thu Feb 12, 2026 3:13 am**

Hi,

the bearings of the lever axle were fitted with PTFE-coated bushings, as the original axle pressed into the housing was replaced with one with a diameter of 6 mm due to its 1/4" diameter, which is now firmly clamped in the lever.

: STUART_MembPu041kl.jpg (64.83 KiB) Viewed 215 times

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Dietrich

Posted: **Sat Feb 14, 2026 9:08 am**

Hi,

the assembled and well tested pump. It has 7 mm stroke but i will reduce it to 6 mm, so is a clearance in the dead centres of 0,5 mm. The lever is in upper dead center position (delivery stroke).

: the assembled pump; STUART_MembPu084kl.jpg (89.79 KiB) Viewed 67 times

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Dietrich

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