| Author |
Message |
 Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
 Forum: Builders Reports Posted:
Mon Jan 29, 2018 11:48 pm Subject: Jolt & friends - Team Overkill - NSW |
| good to see you building again Nick. I was getting withdrawal symptoms from missing your thread. |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Tue Nov 29, 2016 3:33 am Subject: Jolt & friends - Team Overkill - NSW |
some random ideas:
power steering pump?
convertable roof hydraulics pump
"parts washer" pumps
for tig rig: 2 pressurised containers, using airpressure instead of a pump, alternating which chamb ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Sun May 01, 2016 8:07 pm Subject: Jolt & friends - Team Overkill - NSW |
| Quick comments on those quad rings: I needed a low friction seal for a work project and tested a whole bunch of seals in different scenarios, such as small cord, large section, hard, soft, PTFE coated ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Sat Jan 02, 2016 4:21 am Subject: Jolt & friends - Team Overkill - NSW |
| Word of warning: just because there're no sliding seals, doesn't mean there're no seals to wear out. From what I've heard the pipes can often fail from the repeated flexing. At least it'll be cheap to ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Tue Apr 21, 2015 9:31 am Subject: shrinking and sliding |
| Aluminium has a higher coefficient of thermal expansion than steel, so cooling it makes the aluminium shrink more than the steel. cooling it 40degree should make it shrink apart by about 10microns, Is ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Wed Dec 31, 2014 9:38 am Subject: Impact load |
I would guess the impact load to be yield stress * bite * width of contact.
So if you're hitting aluminium (yield ~500N/mm^2 for 7075) with a 5mm bite x 50mm long, you have 500N/mm^2 x 250mm^2, so ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Thu Jul 17, 2014 6:43 am Subject: resistance |
I think its possible to coax the pot into giving values in the range you're looking for just by using some biasing resistors.
If you put a resistor in series with the pistol throttle pot between th ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Mon Apr 14, 2014 7:43 am Subject: Jolt & friends - Team Overkill - NSW |
Nick, its was great to meet you today and see your machine in person! Congrats on building such a solid machine.
https://farm8.staticflickr.com/7100/13832009583_8afd69a4d7_c.jpg |
| Topic: Ogre - RG2013 lightweight |
mark_m
Replies: 105
Views: 56653
|
Forum: Builders Reports Posted:
Mon May 07, 2012 11:24 pm Subject: Gyroscopic effect |
I did an analysis of a spinning weapon's gyro effect for a school coursework way back when.
IIRC, if you're trying to maximise energy then a smaller, faster weapon will have a smaller gyro effect f ... |
| Topic: machining thread |
mark_m
Replies: 670
Views: 247889
|
Forum: Technical Chat Posted:
Tue Jun 28, 2011 8:39 am Subject: machining stainless |
We have the same problem at work sometimes (we've got small lathe and only occasionally need to machine stainless).
Stainless work hardens very quickly and can get really tough to cut. I find the sli ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Mon Jun 13, 2011 12:49 am Subject: bumpiness |
| Intuitively I would have thought that 'bumpiness' is directly related to how much torque it can carry. Restoring force is related to how much the field volume (energy) changes by as you rotate the dis ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Wed Jun 08, 2011 7:55 am Subject: glue thickness |
| FYI: generally, the thinner the glue line, the stronger it is. In this instance I'd probably aim for ~0.2mm on diameter, inject the glue first, push the magnet in and make sure that it squirted out ev ... |
| Topic: Jolt & friends - Team Overkill - NSW |
mark_m
Replies: 8590
Views: 2661934
|
Forum: Builders Reports Posted:
Fri Mar 05, 2010 5:21 am Subject: switching the fets off |
| I think what you need is a controller with a a brake feature - ie the outputs are shorted together. Coast mode leaves them floating. I'm not sure if a scorpion mini can have brake enabled. |
| Topic: CAD models |
mark_m
Replies: 228
Views: 137751
|
Forum: General Chatter Posted:
Mon May 18, 2009 5:03 am Subject: angled panels in solidworks |
Assuming you want to make the panels individually, then assemble them:
Extrude the plan view of each panel (basic boss) in a seperate part file. Add chamfers with angle and distances specified to e ... |
| Topic: Vyrt - Team Chuck - England |
mark_m
Replies: 13
Views: 12522
|
Forum: Builders Reports Posted:
Tue Jan 29, 2008 7:40 am Subject: diode positions |
Given that the relays don't have internal diodes, I guess that adding diodes like this will help:
http://tinyurl.com/26votn/.jpg
Or have I got the wrong idea? Most H-bridge diagrams I've seen ha ... |
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