Get Shrekt

[Ocracoke]

I second the use of a drill press. I just have one for holding a standard corded drill in, cost about £15 but worth every penny.

[mrsam]

*Blows away cobwebs*

Been a long time since I posted here, having just returned from a very successful Cheltenham event I thought I’d give a quick update of where Get Shrekt is currently and future plans.

This year has been up and down for Get Shrekt, whether it due to age or my oversights there has always been one problem with it or another. I went into the Featherweight Champs this year feeling pretty confident, the machine had been running great at it last 2 events and it was hitting harder than ever before. It’s run at the event was *fine*, it won its heat and made it to the top 16 but crashed out after that, and the whole event it was plagued with belt tension issues and seemingly it was now too powerful for the bolts holding the disc to the pulley, as these were shearing on particularly big impacts. Honestly post champs I was ready to retire the old boy and focus on my new Featherweight, but I’d already planned to go to Cheltenham so decided to give it some tlc and see if the issues could be fixed.

First up was the issue of shearing the bolts in the pulley, Shrekt has been using 4 m6 countersink bolts since I first built it however these were now not up to the hits it delivers these days. I purchased a milling machine this year so put that to use drilling out the holes in the disc and pulley to 8mm, and adding counterbores for the new cap head bolts. This should stop any bending/shearing but I’d find out at Cheltenham.

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Next on the list was the issue with belt tension, I use a smooth pulley on the weapon (toothed on the motor) to allow it to slip, unfortunately if the belt isn’t super tight to begin with then any belt stretch/wear can cause it to slip instead of spinning the weapon. At the champs I resorted to covering the pulley in tape, which worked but I wanted a more permanent solution. A quick and dirty belt tensioner was made up, literally just some bearings on an m6 bolt and whilst the belt was initially very tight, it would slacken off over time.

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A quick systems check and it was all ready for Cheltenham, unfortunately however I could only make the Sunday due to work commitments. Happy to report that the improvements worked perfectly, Get Shrekt dominated in both Sunday melees and scored some of the biggest hits its ever got. The disc span up first time every time and no bending or shearing of the disc bolts. One issue is that the extra belt tension does seem to be drawing more current, so the tiny (1.8ah) lipos we’re struggling to do a 3 minute fight. This version of Get Shrekt will be retiring at the end of the year, so this was a great way to send it off if I can’t make Robodojo in December.

Apologies for the word vomit, I’ll leave some pictures of some of the damage and try and not leave it another year to post an update.

cheers, Sam

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[Maxamuslead]

hmmmm i wonder what be replacing it..............

[McMullet]

That is an impressive set of damage photos!

It's great to see all the little incremental changes you've made to make GS the monster it is today. Hopefully see you at Robodojo in a couple of weeks for its swansong and looking forward to whatever (presumably ogre-themed?) robot machine you come up with next!