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Refining crackers and T-bolts for work tables with T-slots is shown.
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In one of my videos, I showed how I made long special crackers for a turntable. This expanded its ability to secure large parts:
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Tables with T-slots are made of brittle cast iron and often these slots are destroyed.
Firstly, because the tables are made of brittle cast iron.
Secondly, because of the design of the bolts themselves, crackers and T-slots. The contact occurs in the place where the crackers or bolts of the fillet, and the T-slot does not have a chamfer.
A force is applied at the edge of the protrusion and breaks the protrusion.
The farther away from the wall of the T-slot the force is applied, the greater the bending moment and the more likely the rib will fail.
Due to the fact that the material of the bolts and crackers is steel, that is, they are elastic, the bolt heads and hooks of crackers bend when force is applied to them.
And even in the presence of chamfers and the absence of fillets, the touch will again be along the edges of the T-shaped grooves. And the bolt heads break the ledge.
And if you make crackers of a different design - with grooves, then the force will be applied not at the edge of the ledge, but further from the edge, and therefore the bending moment will be less, and the probability of breakage of the ledge will decrease.
And even if the bolt head is bent, the touch will still be far from the edge of the ledge. And the probability of breakage of the protrusion in the presence of grooves in the bolt is reduced.
I decided to finish my long croutons with the help of an angle grinder with a cutting disc.
I grind grooves of small depth, about 0.5 mm, along the entire length of the cracker. On the one hand and on the other hand.
Even if the cracker loosens a little, it's better to let it break than the protrusion of the T-slot breaks out.
I also make a groove at the T-bolt.
Now I have all crackers and T-bolts have grooves. These grooves reduce the chance of breakage of the T-slot lugs.