What would be a good alloy/ dimensions for an aluminum blowgun?

I would like to order an aluminum tube from McMasters.com but I'm not sure of what kind I should get for a blowgun.  If you could put in the dimensions you would get for a blowgun at http://www.mcmaster.com/#aluminum/=7mdkul that would be great, thank you.  The only set thing I need for the tube is for it to be less than a .50 cal blowgun... If you could tell me if this would be good for a blowgun that would be great: http://www.mcmaster.com/#aluminum/=7mdm28                                                                                                                       Thanks,                                                                                                                         Wafflicious

Question by Wafflicious 8 years ago  |  last reply 8 years ago


Where to find

Alright everybody, I have a project that requires aluminum rods that will fit together. Does anyone know of a place like mcmaster, in the sense that you can pick and choose your sizes and grades but with a quality that is not industrial? McMaster is just too expensive when looking at aluminum rods. Also, what grade of aluminum do all you DIYers find is the best for multipurpose use? All help is appreciated

Topic by wj04 10 years ago  |  last reply 10 years ago


SHop where I can buy everything for DIY?

Hello! I am constantly looking for an online shop that sells various metals, adhesives, materials in general, parts, tubing etc.. AND had worldwide shipping, but it seems there is none. I would like to buy online because all those materials and parts in my country costs a fortune, so DIY is not so good here... I would like to find a site that has all the things that McMaster has, but with worldwide shipping. P.S: Does mcmaster have worldwide shipping?

Question by dsirotic 4 years ago  |  last reply 4 years ago


What does "surface finish: 4-8 rms" mean? Answered

I'm looking through parts on McMaster Carr's website, and I came across one of their shafts. What exactly is an "rms" and what does it look like?

Question by The Ideanator 8 years ago  |  last reply 8 years ago


do I need to grease these bearings? Answered

I ordered these bearings from mcmaster to use in my new electric bike that i'm building for my senior project, but they spin really easily and im not sure wheather or not im supposed to grease them. and if I am, what kind of grease would be best? http://www.mcmaster.com/#ball-and-roller-bearings/=b15r5n

Question by the mechanical engineer 8 years ago  |  last reply 8 years ago


Materials Suppliers for CNC type work

Hi, I've been digging around for material suppliers for machinable plastics, foams and metals (aluminum, copper, brass). I found McMaster-Carr and got great service and it is next day delivery, but shipping can be expensive. Amazon has acrylics and other polycarbs at sometimes reasonable prices. Who do you use as a supplier and has it been a good experience? Thanks, Andy

Topic by AndyWilson 4 years ago  |  last reply 3 years ago


Logo Carved onto human hair

Thought I'd share thisBoing Boing Gadgets' Joel Johnson was at McMaster University yesterday where he met a researcher who used a focus ion beam microscope to carve his school's logo on a human hairI find it amazing how well it came out. If we can do this now, just Imagine what well be able to do in the future! Advertisement spaces in hair?!!!

Topic by Keith-Kid 11 years ago  |  last reply 11 years ago


Where to buy small empty wire spools? Answered

I often buy wire off the internet that doesn't come on spools.  Does anyone know of a reliable company that sells small spools like the one in the picture?  I already googled it, but the sites didn't look very reliable.  Also, I checked McMaster-Carr, and the wire spools are fairy big, but I could settle for them if I can't find small spools. Thanks in advance! -AI

Question by JaredsProjects 8 years ago  |  last reply 7 years ago


Searching for Hardware

I'm desperately seeking hardware for a set of stilts I'm making.  I *need* certain weight grades, etc and am having trouble finding anywhere (online or in the real world) that gives me sufficient information on their products to be sure that what I'm purchasing won't let me down at a crucial moment, like when I'm surrounded by kids and might injure myself or them if I fall. I have looked on several websites (like McMaster-carr) and just can't find the info I need.  Any recommendations would be greatly appreciated.  Thanks!

Topic by dirtfaery 6 years ago  |  last reply 5 years ago


How to secure metal shaft into bearing with larger ID? Answered

A question for mechanical gurus :) I'm building motorized Igus camera slider based on Kokomonstrum design. I have a shaft that's 1/4" OD that needs to go inside bearing block that has bearing with ID of 5/16". I know I need some kind of bushing, but ones I bought at McMaster don't fit bearing opening (even tho they are 5/16 OD). What are my options? Tape wrapped around shaft? Epoxy? Can't think of anything else :(

Question by bratan 7 years ago  |  last reply 7 years ago


Need help wiring up this digital thermometer

I bought a thermometer and probe from McMaster-Carr, but didn't expect that it'd come without a power plug nor a clear way to wire it to the probe. Instead, there are a few connections at the back and I need a hand to make sure I don't break anything. Can anyone here help me identify the right way to wire this for 110v wall power? Do I put one end of the power cord into the 0 VAC socket, and the other into the 115 VAC? Also, the probe terminates in eyelets, where this wants a raw wire for the connection. I can snip them--is that right? And why are the probe wires red and yellow (the unit has inputs for TC+ and TC-). I've attached a photo of the rear of the unit. Thanks for your help everyone. EDIT: I did some research and figured out that my hunch was correct. One connection to 0VAC, the other to 115VAC, and the probe leads into the other side. Works great, too.

Topic by mikejs 10 years ago  |  last reply 10 years ago


Help me find a servo speed controller!

I'm motorizing my camera slider (https://vimeo.com/39175570) in order to use it for time-lapses. I'm using a gear motor, a 8ft circumference timing belt (for 4ft of motion), and a motor speed controller.  I am getting the parts from ServoCity.com and McMaster-Carr.  This is the motor I'm planning on using: http://www.servocity.com/html/10_rpm_precision_gear_motor.html And here is the speed controller I want to use: http://www.servocity.com/html/digital_manual_speed_controlle.html A video of it working: http://www.youtube.com/watch?v=R_t1V5MljvY Although that speed controller would work perfectly for what I'm doing, it's $80. Does anyone in this community know a cheaper place to find a similar device? From what I can tell it works like most speed controllers, by pulse-width modulation. Whatever that is. Here's kind of what I'm looking for: http://www.electronickits.com/kit/complete/motor/k166.htm. This may work fine, but it seems overbuilt for the purpose. Would it still work fine on a smaller motor like I'm going to use? Thanks for the help! -Jason

Topic by John Smith 6 years ago  |  last reply 6 years ago


Removing the pulley on a Dunlap 103-0602 lathe?

I've got an old Dunlap 103-0602 wood lathe (http://vintagemachinery.org/photoindex/detail.aspx?id=9331 - not my post but that's what I have), but the measurements for the pulley seem very strange and irregular.  Anybody know of a 4-step pulley with 2-3/4", 2-1/4", 1-3/8", and 15/16" steps? It's 2.5" wide total on a 5/8" arbor, which are easy to find on McMaster Carr and the like, but those measurements aren't evenly spaced or findable anywhere I've looked online so far. So, first question is does anybody know where I can find a pulley like that?  And if not, anybody know a way to easily get the pulley off the arbor? It's pretty old and gunked up - some WD-40 loosened up the bearing like butter, but no such luck on the pulley itself, squirting through the set-screw holes.  I've got a motor and everything, I'd love to make this usable, but need some advice.  Got any?

Question by Runeshai 6 years ago  |  last reply 6 years ago


Where can I get screws, nuts, bolts and other hardware most cheaply? Answered

I'm planning to build a car-top bike rack based on this gentleman's design: http://www.angelfire.com/vt2/tommymc3/BikeRack.html As I've been pricing materials, I'm pleased to find that the wood, pipe, tubing and conduit will cost me only about $20. I'll need to buy one tool (a rigid backsaw) for about $10.  I was hoping to get away with less than $100 out of pocket for a rack to hold four bikes, but then I hit the screw aisle. Picking out machine screws, nuts, and wing nuts for the uprights and jotting down prices, I hit almost $10 for those items alone.  Then I looked for galvanized angle brackets to attach the uprights to the base, and those plus the screws, etc to attach them were close to $35!  Once I started looking at U-bolts and other things I'd need to put the whole thing together, I got quite discouraged. So, is there a place to go where I can get those kinds of things at more of a discount?  I tried McMaster/Carr, but they sell only in bulk quantities.  Once I'm an old established tinkerer, I'm sure I'll have a workshop full of hardware bits that I can make work, but for now, I'm flummoxed.  Suggestions? Or am I just "screwed"? :-)

Question by yoyology 8 years ago  |  last reply 1 year ago


Having trouble with Marlin RepRap library

I am currently in a senior design group at Saint Louis University and we are working on a "DIY" 3D printer using electronics parts from SainSmart (Arduino Mega 2560 & RAMPS 1.4) & Hardware from McMaster-Carr. We loaded on two libraries to the Arduino: 1) Marlin RepRap (https://github.com/ErikZalm/Marlin/tree/Marlin_v1/Marlin) 2) U8GLIB (https://code.google.com/p/u8glib/) [which is used to supplement the Marlin RepRap] We have the LCD GUI set up and we are sending commands from the LCD to make small X, Y, and Z steps. It seems like the Arduino recognizes the signal and does send it to the stepper motors, but all the motors do are sort of 'vibrate' and not really spin. If we take small steps we get a little movement, usually which is incoherent. We recently moved the voltage down to 10.5V from 12V from our power supply (because of the 1.5V from the USB to the Arduino), because 12 V caused smoke to come from the Arduino's voltage regulator. We don't know if this is causing the problem. We also do not have the heatbed hooked up because we do not need it for our purposes. We are using a 12V 18 Amp PSU. We were able to get the mechanical endstops to work and the fans to work, but we cannot get the motors to work properly. Does anyone have any suggestions, or has anyone worked with this Arduino library who could help us out? BTW: Our SainSmart kit is: http://www.sainsmart.com/3d-printing/3d-printkits/sanguinololu-rev-1-3-a4988-lcd-2004-3d-printer-controller-kit-for-reprap.html Thank you everyone ahead of time for all your wonderful help and guidance!

Topic by JakedGr8 5 years ago  |  last reply 5 years ago