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pre-fitted with 'BY17' or 'BZ17' add-on motor and spotlight, no thread cutter, no shuttle ejector, no take-up lever cover, solid handwheel 128-23 pre-fitted with 'BY8', 'BY9', 'BZ8', or 'BZ9' add-on motor and spotlight, solid handwheel, intended for mounting in a portable case
Ratchet fasteners are the most complex of the three fasteners to thread, but offer advantages in taking up the slack in the webbing and tensioning the assembly. Once the webbing is threaded through the fastener, the ratcheting mechanism is employed to take up the slack and tension the assembly to the necessary level.
Enough upper thread is pulled from above to pass around the bobbin case, which sits loosely inside the hook frame such that loops of thread can pass completely over it. The excess thread, no longer needed, is then pulled back upward by the sewing machine's take-up arm.
Screw jacks are limited in their lifting capacity. Increasing load increases friction within the screw threads. A fine pitch thread, which would increase the advantage of the screw, also reduces the speed of which the jack can operate. Using a longer operating lever soon reaches the point where the lever will simply bend at its inner end.
The thread angle is the included angle, measured at a section parallel to the axis, between the two bearing faces of the thread. The angle between the axial load force and the normal to the bearing surface is approximately equal to half the thread angle, so the thread angle has a great effect on the friction and efficiency of a screw, as well ...
Image credits: muffinnosnuthin #5. A record player. They have 3 speeds, 33 rpm for LPs, 45 rpm for singles and 78 rpm for the old timey records. My grandparents had theirs set to 33.
Leadscrews are manufactured in the same way as other thread forms: they may be rolled, cut, or ground. A lead screw is sometimes used with a split nut (also called half nut) which allows the nut to be disengaged from the threads and moved axially, independently of the screw's rotation, when needed (such as in single-point threading on a manual ...
Business Insider examined dozens of federal trade secrets claims filed by companies over the past decade against current and former employees who also had filed a claim against their employer.