Foot Pedal Mod [treadle pedal * ladep eldaert]

Rigid. Rigidity. How flexible is something, it could be anything, a spaghetti noodle is a good example. At first the spaghetti noodle is very brittle, it’s rigidity is higher at it’s shortest length, but as it continues to get longer it becomes more and more flexible, losing the integrity of it’s rigidity. Or you can take the noodle and stick it in boiling water, depending on how hot the water is (simmering at 110 degrees fahrenheit – 115 degrees fahrenheit, or boiling at 212 degrees fahrenheit) and/or how long the noodle is submerged will affect how rigid it is, this time actually making a difference in the noodles structure causing it to become more and more pliable no matter how long or short. It can be pulled, squashed, and of course looped around itself. Anyhow, the point is, do you prefer your noodles to be firm or soft? If the noodle were to replace the crossbeam on the Brother’s foot pedal, you would want it to be very stiff, and have a highly rigid structure. Part of keeping all of these parts from losing that rigidity was in making sure that where there were connections between the table stand and the crossbeam, that the bushings (used) provided the largest footprint to utilize as much surface area for rigidity as possible. Closing the tangent.

The crossbeam was about 4″ wide, but would only be able to use one bolt – through the center (one at each end of the beam) – for it’s anchor. So as you can imagine it was important to use that four inches of surface area as best as possible. Taking a 2″x4″ section of wood, cut into 4″ sections – the crossbeam could be lowered from the sewing table’s existing legs about 3.5″ and fit almost perfectly between the sewing tables legs/base (which is made of 2″ square steel tubing) and the crossbeam*. What we have here is a 2″x4″ wood washer – spacing out the pedal from the table’s legs/base to the as close to the floor as possible. If the pedals crossbeam were bolted directly underneath the tables legs/base, it would sit about 4″ – 5″ off of the floor which is not comfortable at all, your leg ends up being cramped up (like driving a car a long distance with the seat pushed too far forward). As you can see in the images, all you need is a couple of blocks of wood. Also, with the extra threads on the bolt, there is still room to lower the entire pedal assembly another 3/8″ of an inch, obviously there are more threads available but the nut needs to be fastened somewhere. Bringing the assembly down that last 3/8″ would be better, as right now it is hard to get a good position while your seated. Raising the stool height to extend the leg more has helped, but it is still not quite right, plus every time the stool is raised you have to raise the table top too, so it can be a never ending battle.

*It is not really a beam, but instead a sort of plate. It is essentially a piece of flat bar stock that has had its two long edges bent at 90 degrees towards what would be its bottom end or base.

This has been a long overdue set of pictures per the request of jreidko, cheers, http://www.jreidko.com/

3 Comments so far

  1. Jreidko December 14th, 2007 9:40 am

    With the foot pedal assembly all cantilevered out like that does it bend when you press down ont he pedal? (Levering against the side where it’s bolted to the frame?)

  2. admin December 14th, 2007 10:34 am

    This is part of the issue. Usually the crossbeam for the pedal would be anchored down in all four corners. Obviously here the beam was only able to be anchored down in the center because drilling through the tables legs/base to provide the second set of holes was not an easy option. However, fortunately, all of the places of contact are centered (the next best option). The pivot of the pedal is centered on the beam, and the beam has it’s anchor points centered on each end. With the blocks in place, that provides stability at equal rates on all four corners of the beam (when tightened down adequately). This is a tough thing to put into words, but by having the displacament of all these forces set up like this solves the issue of bending – or unwanted flexibility. So, no it does not bend, or at least not noticeably. If it did so in a way that hampered performance it would be resolved.

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