My Math Forum in need of a formula asap

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 July 12th, 2019, 05:23 PM #1 Newbie   Joined: Jul 2019 From: UK Posts: 4 Thanks: 0 Math Focus: engineering mathematics, cause and effect in need of a formula asap Hi, I am for all intents and purposes New here, I have an issue where I am designing and making a full scale guillotine prop. My question is taking gravity as the driving force of one object in motion, how far from a dead switch would the second moveable object have to be to fall at the same speed as the first object in motion? i have designed many stunts in my time and I tend to use the trial and error method of making something work, usually using crash dummies and sand bags, but this one requires unadjustable mechanisms, so it would require several rebuilds to work in this manor. Unfortunately, time and budget doesn't allow in this instance; it is kind of a crucial calculation, as decapitation is kinda undesirable. thanks in advance. Madmad Geoffers Esq... Last edited by skipjack; July 12th, 2019 at 06:52 PM.
 July 12th, 2019, 05:54 PM #2 Senior Member   Joined: Jun 2019 From: USA Posts: 202 Thanks: 80 I don't quite get what you're asking. Could you draw a diagram to make it clearer? Also, I want to make sure you're not relying on two things to fall at the same rate to stop the blade. If it's just to hide the illusion, that's one thing, but no sane engineer or magician would OK a device where a slight misalignment or small amount of friction could potentially lead to decapitating someone. PLEASE make sure a competent engineer looks over your design before any human gets anywhere near it.
 July 14th, 2019, 03:34 AM #3 Newbie   Joined: Jul 2019 From: UK Posts: 4 Thanks: 0 Math Focus: engineering mathematics, cause and effect Hi dude no the blade is both retractable and blocked from any potential contact from skin via a steel sheath, the two objects falling are to hide the ilusion predominantly, the steel sheath can be locked off so as to slice fruit for effect via a mechanical switch, my problem lies with both objects falling disjointed at the minute, the decapitation bit was for dramatic effect only to encourage an answer to be honest thanks MMG
 July 14th, 2019, 03:36 AM #4 Newbie   Joined: Jul 2019 From: UK Posts: 4 Thanks: 0 Math Focus: engineering mathematics, cause and effect i will try add design drawings sometime on wednesday when i am back in the workshop thanks MMG
 July 14th, 2019, 06:34 AM #5 Global Moderator   Joined: Dec 2006 Posts: 20,969 Thanks: 2219 Typically, the guillotine is real, but can't operate until the real head has been replaced by a prop. Thanks from MadmadGeoffersEsq
 August 5th, 2019, 01:36 PM #6 Newbie   Joined: Jul 2019 From: UK Posts: 4 Thanks: 0 Math Focus: engineering mathematics, cause and effect IMG_20190805_220415.jpg IMG_20190805_220451.jpgok so this is a quick plan sketch which shows all relevant info, the question is in the question marks thanks in advance MMG

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