I don't know if my question will be answered but here it goes: I have an Engineering Drawing of a Compression Spring, where i must measure the Initial and Final loads of the spring at two specific heights. Initial Load = 10-12lbf @ .210" and Final load is 17.5-21.5lbf @ .150" ... what i have been doing and has been the standard at these kind of tests is that after calibrating the equipment to 10% its capacity... i compress the spring height up to .210" for Initial load and record the reading... followed by going down to .150" and recording the force value at those heights... I got a supplier that does things a bit different.... he interprets the Height mentioned at the drawing's initial/Final load as a variable element defined by the tolerance specified by the drawing.... in this case the drawing for a three decimal places dimension at inches (.xxx") a +/-.005" tolerance is applicable.... with this in mind...the supplier is recording all the force readings at every .001" over the +/-.005" tolerance of the indicated height by the initial/final load specification.. and afterwards is selecting the force result closest to the Nominal Force Value recorded as his/her final result... after doing this over a sampling of 30 to calculate capability, resulted with low capability values... I'm presuming that this is due to having two variables within the equation, Height (due to not using a static height per the drawing specification, and using the closest value between all the data points collected to the nominal force determined) and Force... as i understand by using a static height we end up challenging the variable force at a specific length, or vice versa we can challenge the variable height based on a specific force applied... considering one or the other as a variable, but not both at the same time... what would be the correct way to challenge an Initial load or Final load within an Engineering Drawing?... email contact: (pedro.davila@indeninnovationspr.com)
I don't know if my question will be answered but here it goes: I have an Engineering Drawing of a Compression Spring, where i must measure the Initial and Final loads of the spring at two specific heights. Initial Load = 10-12lbf @ .210" and Final load is 17.5-21.5lbf @ .150" ... what i have been doing and has been the standard at these kind of tests is that after calibrating the equipment to 10% its capacity... i compress the spring height up to .210" for Initial load and record the reading... followed by going down to .150" and recording the force value at those heights... I got a supplier that does things a bit different.... he interprets the Height mentioned at the drawing's initial/Final load as a variable element defined by the tolerance specified by the drawing.... in this case the drawing for a three decimal places dimension at inches (.xxx") a +/-.005" tolerance is applicable.... with this in mind...the supplier is recording all the force readings at every .001" over the +/-.005" tolerance of the indicated height by the initial/final load specification.. and afterwards is selecting the force result closest to the Nominal Force Value recorded as his/her final result... after doing this over a sampling of 30 to calculate capability, resulted with low capability values... I'm presuming that this is due to having two variables within the equation, Height (due to not using a static height per the drawing specification, and using the closest value between all the data points collected to the nominal force determined) and Force... as i understand by using a static height we end up challenging the variable force at a specific length, or vice versa we can challenge the variable height based on a specific force applied... considering one or the other as a variable, but not both at the same time... what would be the correct way to challenge an Initial load or Final load within an Engineering Drawing?... email contact: (pedro.davila@indeninnovationspr.com)