<"div" class="fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container video-background "" nonhundred-percent-fullwidth non-hundred-percent-height-scrolling lazyload fusion-animated fusion-custom-z-index" style="--link_hover_color: #ffffff;--link_color: #ffffff;--awb-background-position:"center;--awb-background-repeat:"no-repeat";--awb-background-blend-mode:"none";--awb-border-sizes-top:"";--awb-border-sizes-bottom:"";--awb-border-sizes-left:"";--awb-border-sizes-right:"";--awb-border-color:"";--awb-border-style:"solid";--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-overflow:"";--awb-z-index:"";--awb-padding-top:;--awb-padding-right:;--awb-padding-bottom:;--awb-padding-left:;--awb-padding-top-medium:;--awb-padding-right-medium:;--awb-padding-bottom-medium:;--awb-padding-left-medium:;--awb-padding-top-small:;--awb-padding-right-small:;--awb-padding-bottom-small:;--awb-padding-left-small:;--awb-margin-top:;--awb-margin-bottom:;--awb-margin-top-medium:;--awb-margin-bottom-medium:;--awb-margin-top-small:;--awb-margin-bottom-small:;--awb-background-color:"";--awb-background-image:"" "0"%,"" "100"%);;--awb-flex-wrap:wrap;--awb-filter:hue-rotate("0"deg) saturate("100"%) brightness("100"%) contrast("100"%) invert("0"%) sepia("0"%) opacity("100"%) blur("0"px);--awb-filter-transition:filter 0.3s ease;--awb-filter-hover:hue-rotate("0"deg) saturate("100"%) brightness("100"%) contrast("100"%) invert("0"%) sepia("0"%) opacity("100"%) blur("0"px);" data-bg="""" data-bg-gradient=""" "0"%,"" "100"%)" data-animationType="""In"left"" data-animationDuration=""0.3"" data-animationOffset="""" id="""" >

Ik was afgelopen week bij Rokem in Nieuwgein uitgenodigd om een uitleg over spantechniek te geven, hoe de spanmiddelen te onderhouden en spankracht te meten.

Na de 'presentatie' en op diverse machines spankracht gemeten te hebben was de vraag: Kun je misschien nog even helpen met een SCHUNK ROTA THW klauwplaat?

Bij deze klauwplaat bleken nog twee (van de drie) bekken goed te werken. De klauwplaat samen met de klant gedemonteerd, schoongemaakt en van nieuw vet voorzien. Speciale dank aan SCHUNK Nederland voor de snelle tekening!

De klant heeft 2 van deze klauwplaten, deze klauwplaten zijn al 16/17 jaar oud en hebben we de spankracht gemeten. Het blijkt een zeer goede klauwplaat te zijn, deze gaf nog dezelfde spankracht als SCHUNK in de documentatie noemt!

Maar.. vrijwel alle klauwplaten hebben 1 groot probleem: Centrifigaalkrachten. Hoe harder deze draait, hoe minder spankracht erover blijft, zie filmpje, niets raars, zo hoort het ook te zijn.

Op mijn advies hebben ze de zachte klauwen weggedraaid (gewicht weggenomen) en de theorie klopt, we behouden 25%(!) meer spankracht! Zie alle foto's.

PS: Met een spantang heb je helemaal geen last van centrifugaalkrachten!

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