Egstonvonbrick, thanks for that, I'm sure it helps to know in advance what is likely to go wrong, that way those making their first one can learn from the experience of others like yourself.
As a boy I painted arrows in my hand. The rings looked like I had been riding my bike at the same time. Is getting clean even width rings fairly easy? A wobbly hand would make for a messy finish, or am I wrong?
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1) As previously mentioned i'm a cack-handed-oaf and therefore any assistance to my first attempt at 'hand' cresting was welcome (yours may have looked like they were painted whilst on a bicycle - mine were like i was being bounced around inside a Panzer). Once i'd smoothed out the mechanics the rest was down to my patience, a decent paintbrush applied perpendicular to the shaft and good paint.
2) Being a simple chap i was originally all against this frilly cresting malarky. But... being a miser and managing to knock one up for free, this is what made me have a go - as i could pretend i was saving money
I was pleasantly surprised at the outcome and will continue to crest away.
I too have made one on an old plank with a scalextrix motor. I use the guts of an old scalextrics (slotcar) handthrottle to control speed.
I power it from a mobile phone charger transformer giving out 5V
My arrow rests are made from lego.
I use a bit of plastic rod sharpened to a flat end to fit in the nock.
Issues I've had...
1 - If you arrow is not straight it will rattle about - at best you get crestings on one side of the arrow only, at worst it jumps off of the jig. Having moving rests will help this quite a bit - mine are fixed - I just superglued everything together....
2 - gripping the nock - I'm going to surgical tubing next - my plastic rod is too harsh and can ping off.
3 - Use good paint - the little humbrol enamels are ideal.
You can get great results with patience - I've seen Egstons efforts and they look very nice.