Dual 7" Servo - Page 15

Mike · #**281** 23rd December 2011, 14:23

Hi all

The guy cutting the adaptors has not been able to fit them in pre - Christmas, so they will now be made in the New Year - sorry.
I'll let you all know as soon they are available.

regards to all

Mike

Mike · #**282** 31st December 2011, 10:48

Quote:

Originally Posted by Mike

Hi all

The guy cutting the adaptors has not been able to fit them in pre - Christmas, so they will now be made in the New Year - sorry.
I'll let you all know as soon they are available.

regards to all

Mike

Adaptor Plates (those who had a preference for stainless)

I have spoken to a couple of people, including fabricator/welders, who have advised against making the adaptor plates from stainless plate/thread, as it does not have the same tensile qualities as mild steel. Given that these are going to be highly safety critical items subjected to tensile load, I would not like to be responsible for supplying something which might fail (however small the risk), and would prefer to supply mild steel only.

I am quite happy to order and supply substitute mild steel plates instead of stainless, or refund those who prefer to get their own stainless ones made at their own volition. (I can forward a drawing if anyone would like one).

Please let me know if you are happy to go with the mild steel, and PM me your bank details for the £3 refund: or the full £12.50, if you prefer to source your own.

I apologise for any disappointment this may cause, but I am sure you can understand my concern/reasoning.

Very best wishes to all for the New Year

Mike

cabrioman · #**283** 31st December 2011, 12:17

Hi Mike

As we discussed, from a safety perspective, I will go with mild steel. Don't worry about the price difference, its not worth the effort for the sake of £3.00.

John

Patrick · #**284** 31st December 2011, 12:30

That's fine don't worry about the £3

GreatOldOne · #**285** 31st December 2011, 16:28

Mild steel ok with me, call it quits on the £3.

denniswpearce · #**286** 31st December 2011, 18:56

Mild steel is fine with me also. Don,t want the £3 back, but thanks for offering it.

Mike · #**287** 6th January 2012, 19:33

Hi Guys - Happy New Year to you all

The adaptor plates have been made and are now with me, ready for dispatching. Many of you have said "Don't rush to send mine - the car is in bits!". So, are there any of you who would like to be in the early batch to be sent out? - particularly anyone who has their car on the road over winter, who can give us some more feedback on their findings?
GOO will be included in the first complete kit batch, for all his sterling efforts in testing the prototype, and Mashtun who helped greatly with his drawings. I'm also putting Nigel at the front of the queue for his fantastic help on my engine wiring - I'm easily bought!

Seriously, if anyone would like to PM me for a quick dispatch, please do as most are happy to wait a couple of days extra.

Regards to all
Mike

Grey V8 Pete · #**288** 9th January 2012, 16:45

Hi Mike.
Have just sent you a PM.
Peter.

Grey V8 Pete · #**289** 9th January 2012, 17:13

This is interesting as I had earmarked my local Screwfix as a source of Stainless Steel C'sk screws for the master cylinder. They list them as High Tensile Stainless but now I am thinking of reverting to Mild Steel.

Metal tensile strength differences aside, my understanding is that a high tensile screw is formed by rolling in the thread form so the grain pattern of the metal flows up and down the thread form, which makes the thread much stronger than a machine cut thread. In a machine cut thread the grain pattern of the original bar runs parallel to the axis and so will run across the thread form producing lines of potential weakness in the thread.

It would be interesting to know comparative UTS figures for Mild Steel and Stainless and if so what the material specs are?

Peter.

Quote:

Originally Posted by Mike

Adaptor Plates (those who had a preference for stainless)

I have spoken to a couple of people, including fabricator/welders, who have advised against making the adaptor plates from stainless plate/thread, as it does not have the same tensile qualities as mild steel. Given that these are going to be highly safety critical items subjected to tensile load, I would not like to be responsible for supplying something which might fail (however small the risk), and would prefer to supply mild steel only.

I am quite happy to order and supply substitute mild steel plates instead of stainless, or refund those who prefer to get their own stainless ones made at their own volition. (I can forward a drawing if anyone would like one).

Please let me know if you are happy to go with the mild steel, and PM me your bank details for the £3 refund: or the full £12.50, if you prefer to source your own.

I apologise for any disappointment this may cause, but I am sure you can understand my concern/reasoning.

Very best wishes to all for the New Year

Mike

Patrick · #**290** 9th January 2012, 19:44

I need to service my tin top this weekend so not in a massive rush

Mike · #**291** 9th January 2012, 19:53

Stuart

I have sent a PM - can you contact me, please?

Regards
Mike

Mike · #**292** 10th January 2012, 16:29

Hi Guys

All servos have now been dispatched for delivery
(bar Cabrioman, as requested).

I would appreciate a quick PM acknowledging safe receipt, please.

...........and of course any feedback from anyone who can test theirs, as I am sure we will all have a slightly different experience, due to variances with master cylinder bores, pedal ratios, brake pots, pads, discs, drums etc.

I hope they all meet with your expectations.

Have fun!

Regards to all
Mike

Grey V8 Pete · #**293** 10th January 2012, 16:44

Have found the following website giving some insight into the Stainless Steel vs Mild Steel strength issue.

http://www.volksbolts.com/faq/basics.htm

Peter.

Patrick · #**294** 10th January 2012, 17:20

Thanks very much Mike

Mike · #**295** 10th January 2012, 17:24

I think stainless would have been ok!!!!!!!!!!!!!!!!!

Based on these figures an M8 bolt, which has a cross section width conservatively of 7mm, has a radius of 3.5mm, and therefore a cross sectional area of 36.75mm2. So, at 700N/mm2 = 25.7kN = 4,250lbs per bolt, it would take in excess of 3.5 TONS of force for the bolts to fail.

Anyone got a right foot that heavy!

May be this is a little flippant, as the failure is likely to be stripping the threads, rather than on the cross section failing?
Anyone any ideas how to calculate that?

Mike

Quote:

Originally Posted by Grey V8 Pete

Have found the following website giving some insight into the Stainless Steel vs Mild Steel strength issue.

http://www.volksbolts.com/faq/basics.htm

Peter.

morris · #**296** 10th January 2012, 19:48

great news mike, will turn up in perfect time for me to finish all me pedal box building

NigelB · #**297** 10th January 2012, 19:56

Quote:

Originally Posted by Mike

Anyone got a right foot that heavy!

Only on the right pedal.......................!!

Patrick · #**298** 10th January 2012, 21:20

Quote:

Originally Posted by NigelB

Only on the right pedal.......................!!

this should hopefully sort that 0.5 seconds when someone in a tin top with ABS and a servo bigger than their engine slows down quickly in front of you and you just put your foot through the floor

Mike · #**299** 11th January 2012, 17:42

Stuart

Can you contact me please, and leave me your number? Richard is inTaunton TOMORROW (Thursday 12th) and would like to deliver your servo.

Regards
Mike

peterux · #**300** 12th January 2012, 12:20

Hi Mike,
I got my Servo delivered today!

It looks very strong and well made, but a bit more weight

Thanks again for all your efforts in sourcing and shipping them all out to us.