New HW design - Omni Wheels and 30kW spinner

[TechAUmNu]

Well just one of the 4 plates we needed for each the original omni wheels would cost £400 from protolabs (£4800 for the 3 wheels). The same part would cost us £15 to mill ourselves (£180 total)! That's more than our mill cost to build lol.

[typhoon_driver]

A fair price for the time involved in machining them all. You don't have to pay yourself for your time so it works out cheaper.

[TechAUmNu]

Yeah. Although I also put in a 100x100x20mm 6061 plate with 1 hole and it was £200, so seems they are just really expensive to start with. Which comes from being a quick turn prototype place.

I have been asking for quotes for our iD620mm oD700mm thickness 40mm hardox ring with 50 10mm holes spaced round it and it seems kinda expensive. Lowest was from k-cut at £1095 + VAT which is kinda a lot! Where are people getting theirs done and for how much? If that is just how much it costs then I am happy to pay it, but just thought it was a tad high.

[overkill]

You are paying for the scrap in the centre - perhaps you can nest some parts from other builders in there to offset the cost.

[typhoon_driver]

Been a while since I ordered up hardox on it's own but your piece would require a 720mm by 720mm by 40mm (give or take) piece off the bat which wouldn't be cheap.


I assume everywhere just gave you a flat price rather than material and time?

[TechAUmNu]

You are paying for the scrap in the centre - perhaps you can nest some parts from other builders in there to offset the cost.

Does anyone want any 40mm hardox pieces?


The price for the ring without holes was £723+VAT, so most of that will be time.

[typhoon_driver]

Could always buy some bosch multi construction 10mm bits and go to town with a pillar drill. Should be able to get 2 to 3 holes out of a single bit.

http://www.axminster.co.uk/bosch-mul...l-bits-ax35478

I drilled our 10mm holes through the 20mm thick disc with two bits. They don't like pilot holes and interestingly coolant made them worse for drilling. Drilling compound worked best.

[TechAUmNu]

How many holes was that?

I can probably get a nice coated carbide drill and do it in my little cnc, if I take all the shielding off it should fit. e.g. http://www.cutwel.co.uk/hole-making/...eam-drills-5xd

I don't have a proper pillar drill which is a bit annoying. Might buy one just to do this!

[typhoon_driver]

4 holes but I nackered my first bit getting through the first with the pilot hole. The other bit got the 3 holes drilled no pilot in 10mm and could have continued drilling. I've use cobalt bits in the past and whilst they were good at getting through when sharp I did find that they dulled very quickly.

You want a very slow speed for drilling.

[JakeForsey]

Hey Jake,
You guys planning on entering next series? Will be hilarious to see them bouncing off each other!

Yes! Assuming it happens!

[maddox10]

A piece of hardox 750*750*40 weights 178 kg, and with a kilo-price of hardox being around £3 you're talking up £600.

[TechAUmNu]

A piece of hardox 750*750*40 weights 178 kg, and with a kilo-price of hardox being around £3 you're talking up £600.

OK, so getting some more parts in the middle should significantly decrease the per part price.

[typhoon_driver]

Or the other option would be to do what we did with the middle weight typhoon and either salvage or purchase a piece of metal pipe with roughly the right dimensions and weld some hardox teeth onto it.

[TechAUmNu]

We want to make some kind of spinner protection for our bearing system, so can probably use a lot of the middle for that.

Have you tried tapping holes?

[typhoon_driver]

Tapping in hardox? Haven't done it but I'm aware that the SSAB website says it's possible. Probably need some taps a bit better than a set from silverline etc.