Prusa I3 Rework

I am into 70% of my printer purchased and ran into a snag and that is how long are the 5 M3 Grub Screws?

Thanks.

Edited 1 time(s). Last edit at 01/01/2014 03:31AM by Dark Alchemist.

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I await Skynet and my last vision will be of a RepRap self replicating the robots that is destroying the human race.

i got this from a vendor site that sells bolt kits for prusa. what are the grub screws used for? if they are for the pulleys then does it really matter what length they are. if they are over 4mm, should then not provide enough grip force to hold the pully in place?


12 x M10-1.50 nut, zinc
12 x M10 flat washer, zinc

34 x M8-1.25 nut, zinc
34 x M8 flat washer, zinc

4 x M5-0.8 nut, zinc

50 x M3-0.5 nut, zinc
50 x M3 flat washer, zinc
12 x M3-0.5 nyloc nut, zinc

24 x M3-0.5 x 10mm socket head cap screw, black oxide
10 x M3-0.5 x 15mm socket head cap screw, black oxide
16 x M3-0.5 x 20mm socket head cap screw, black oxide
5 x M3-0.5 x 35mm socket head cap screw, black oxide
3 x M3-0.5 x 40mm socket head cap screw, black oxide
3 x M3-0.5 x 8mm socket head set screw, black oxide
1 x M8-1.25 x 20mm socket head set screw, black oxide

here is another parts list: [forums.reprap.org]



==The gregstruder==
Plastic parts needed:
-Extruder body
-Extruder idler
-Extruder large gear
-Extruder small gear

Other parts needed:
-1 NEMA17 motor
-1 hotend
-1 M3x8 grub screw
-6 M3 nuts-
3 M3x40 bolts
-1 M8x20 grub screw
-1 M8 hobbed bolt
-4 M8 washers
-2 M8 nuts
-3 608 skateboard bearings
-3 M3x10 bolts
(optional) 2 short, stiff springs or silicone pads

===Assemble the X axis (P2)===
Plastic parts needed:
-x axis motor end
-x axis idler end
-x carriage

Other parts needed:
-1 NEMA17 stepper motor
-1 T2.5 belt
-3 M3x10 bolt
-1 belt drive pulley
-1 M3x8 grub screw
-1 ??? bolt
-1 ??? bearing
-7 linear bearings
-7 M3x25 bolt with nut and washers
-2 smooth rods

===Assemble the Y axis(P2)===
Plastic parts needed:
-y axis motor holder
-4 y corners
-y axis idler
-y belt clamp
-3 y bearing holders

Other parts needed:
-1 23x23cm 12mm plate (9"x9" 1/2" thick for people in inchy countries) (may be thinner)
-1 heated bed PCB, with wires attached
-1 glass plate covered with Kapton or PET tape
-1 NEMA17 stepper motor
-1 T2.5 belt
-2 M3x10 bolt
-1 belt drive pulley
-1 M3x8 grub screw
-1 ??? bolt
-1 ??? bearing
-3 linear bearings
-3 M3x25 bolt with nut and washers
-2 405mm smooth rods
-22 M8 nuts (substitute 5/16" for M8 in inchland)
-22 M8 washers
-12 M10 nuts (?? in inchland)
-12 M10 washers
-4 140mm M8 (5/16") threaded rod (longer is ok)
-2 430mm M10 (??/16") threaded rod (longer is ok)
-9 3.5x12mm wood screws (or shorter if your plate is thinner)

Edited 3 time(s). Last edit at 01/01/2014 09:23AM by jamesdanielv.

Just not sure and 35mm is pretty darn long and too long to be used, if this is where they are really being used at, to hold anything on the motors as the motor wouldn't be able to turn AND it wouldn't be able to have the plastic printed parts put on it.

I wish the person who did that wiki would see this and fix that one piece because I can't just buy all of the hardware then see what I need as I am in the states and finding metric isn't as easy as going down to my local hardware store (I wish it was though).

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I await Skynet and my last vision will be of a RepRap self replicating the robots that is destroying the human race.

The set screws are typically M3-.5 x 8 mm and are for the pulleys. There are three, one for the extruder drive, one each for each motor as it corresponds with the printed parts BOM. If you are using metal pulleys the set screws are usually included and are also M3 X 8 BUT I've gotten a couple of shipments with slotted heads instead of socket heads. The M8-1.25 x 20 mm set screw is the extruder idler. The 35 mm socket head cap screws can be used in a few places as can the 40 mm screws. Typically the extruder or X carriage mounts depending on the build.

The only part that stands out on a rework build is the M3 x 60 mm screw. It's a a bear to find in the US and I don't know that it needs to be that long. It's used as the extruder idler tensioner. I buy several thousand fasteners a month from the biggest distributors in the US and the 60 mm was tough to find and was only available to me as a hex head without ordering from overseas. For those sets I've been including M3 x 45 and recommending springs to match. I haven[t yet printed one of the extruders but it seems that 45 mm is enough with the matching spring. Those that want a 60 mm can use a 4-40 machine screw 2 1/2" with matching nuts for the approximate metric equivalent.

Quote
vegasloki
The set screws are typically M3-.5 x 8 mm and are for the pulleys. There are three, one for the extruder drive, one each for each motor as it corresponds with the printed parts BOM. If you are using metal pulleys the set screws are usually included and are also M3 X 8 BUT I've gotten a couple of shipments with slotted heads instead of socket heads. The M8-1.25 x 20 mm set screw is the extruder idler. The 35 mm socket head cap screws can be used in a few places as can the 40 mm screws. Typically the extruder or X carriage mounts depending on the build.

The only part that stands out on a rework build is the M3 x 60 mm screw. It's a a bear to find in the US and I don't know that it needs to be that long. It's used as the extruder idler tensioner. I buy several thousand fasteners a month from the biggest distributors in the US and the 60 mm was tough to find and was only available to me as a hex head without ordering from overseas. For those sets I've been including M3 x 45 and recommending springs to match. I haven[t yet printed one of the extruders but it seems that 45 mm is enough with the matching spring. Those that want a 60 mm can use a 4-40 machine screw 2 1/2" with matching nuts for the approximate metric equivalent.

WOW, thank you so very much for such a detailed explanation but I do not understand, yet, what you were saying about the M3.

Thank you so much and when I start building this I will understand then I bet.

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I await Skynet and my last vision will be of a RepRap self replicating the robots that is destroying the human race.

Quote
Dark Alchemist

Quote
vegasloki
The set screws are typically M3-.5 x 8 mm and are for the pulleys. There are three, one for the extruder drive, one each for each motor as it corresponds with the printed parts BOM. If you are using metal pulleys the set screws are usually included and are also M3 X 8 BUT I've gotten a couple of shipments with slotted heads instead of socket heads. The M8-1.25 x 20 mm set screw is the extruder idler. The 35 mm socket head cap screws can be used in a few places as can the 40 mm screws. Typically the extruder or X carriage mounts depending on the build.

The only part that stands out on a rework build is the M3 x 60 mm screw. It's a a bear to find in the US and I don't know that it needs to be that long. It's used as the extruder idler tensioner. I buy several thousand fasteners a month from the biggest distributors in the US and the 60 mm was tough to find and was only available to me as a hex head without ordering from overseas. For those sets I've been including M3 x 45 and recommending springs to match. I haven[t yet printed one of the extruders but it seems that 45 mm is enough with the matching spring. Those that want a 60 mm can use a 4-40 machine screw 2 1/2" with matching nuts for the approximate metric equivalent.

WOW, thank you so very much for such a detailed explanation but I do not understand, yet, what you were saying about the M3.

Thank you so much and when I start building this I will understand then I bet.

Just like your other post about this...M3 is metric, 4-40 is standard, 4-40 is a roughly the same size as M3. Like you've been told by multiple people on IRC, you can either source your parts from McMaster and get what the list says or you can work with what you have and source metric/inch together. As much as you tried to save on washers I don't know why you would want to source something like this from a hardware store when it's going to be much cheaper at McMaster. First off, anything Metric or anything in a drawer in the hardware aisles at Lowes/Home Depot is overpriced. They charge like $1.50 for 5 washers when you can go to the drawers and get 15-20 of the "standard" ones for $1.50.

Quote
tjb1

Quote
Dark Alchemist

Quote
vegasloki
The set screws are typically M3-.5 x 8 mm and are for the pulleys. There are three, one for the extruder drive, one each for each motor as it corresponds with the printed parts BOM. If you are using metal pulleys the set screws are usually included and are also M3 X 8 BUT I've gotten a couple of shipments with slotted heads instead of socket heads. The M8-1.25 x 20 mm set screw is the extruder idler. The 35 mm socket head cap screws can be used in a few places as can the 40 mm screws. Typically the extruder or X carriage mounts depending on the build.

The only part that stands out on a rework build is the M3 x 60 mm screw. It's a a bear to find in the US and I don't know that it needs to be that long. It's used as the extruder idler tensioner. I buy several thousand fasteners a month from the biggest distributors in the US and the 60 mm was tough to find and was only available to me as a hex head without ordering from overseas. For those sets I've been including M3 x 45 and recommending springs to match. I haven[t yet printed one of the extruders but it seems that 45 mm is enough with the matching spring. Those that want a 60 mm can use a 4-40 machine screw 2 1/2" with matching nuts for the approximate metric equivalent.

WOW, thank you so very much for such a detailed explanation but I do not understand, yet, what you were saying about the M3.

Thank you so much and when I start building this I will understand then I bet.

Just like your other post about this...M3 is metric, 4-40 is standard, 4-40 is a roughly the same size as M3. Like you've been told by multiple people on IRC, you can either source your parts from McMaster and get what the list says or you can work with what you have and source metric/inch together. As much as you tried to save on washers I don't know why you would want to source something like this from a hardware store when it's going to be much cheaper at McMaster. First off, anything Metric or anything in a drawer in the hardware aisles at Lowes/Home Depot is overpriced. They charge like $1.50 for 5 washers when you can go to the drawers and get 15-20 of the "standard" ones for $1.50.

As far as "as you've been told by multiple people on IRC" I posted this thread before I was told and it is always nice to get the viewpoints and knowledge from people who would never step foot into IRC.

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_______
I await Skynet and my last vision will be of a RepRap self replicating the robots that is destroying the human race.

Quote
vegasloki
The set screws are typically M3-.5 x 8 mm and are for the pulleys. There are three, one for the extruder drive, one each for each motor as it corresponds with the printed parts BOM. If you are using metal pulleys the set screws are usually included and are also M3 X 8 BUT I've gotten a couple of shipments with slotted heads instead of socket heads. The M8-1.25 x 20 mm set screw is the extruder idler. The 35 mm socket head cap screws can be used in a few places as can the 40 mm screws. Typically the extruder or X carriage mounts depending on the build.

The only part that stands out on a rework build is the M3 x 60 mm screw. It's a a bear to find in the US and I don't know that it needs to be that long. It's used as the extruder idler tensioner. I buy several thousand fasteners a month from the biggest distributors in the US and the 60 mm was tough to find and was only available to me as a hex head without ordering from overseas. For those sets I've been including M3 x 45 and recommending springs to match. I haven[t yet printed one of the extruders but it seems that 45 mm is enough with the matching spring. Those that want a 60 mm can use a 4-40 machine screw 2 1/2" with matching nuts for the approximate metric equivalent.

Well, I made my extruder today (hobbed bolt came in) and I can't find a place for a m3-0.5x60mm locally and I don't even have a place for 1/8" or a M4 x 2-2.5 inches locally. I will have to see if there is a fastener place around here that will sell me only two bolts/washers/nuts but most of them wat to sell hundreds.

I only need the frame to go (smooth rods get shipped tomorrow from Misumi) and I can start to build everything so I am a whole lot closer.

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I await Skynet and my last vision will be of a RepRap self replicating the robots that is destroying the human race.

Hi,
about rod lenght!!
[www.dropbox.com]

can you help me? which is right (rework) ??

Quote
Barrubba
Hi,
about rod lenght!!
[www.dropbox.com]

can you help me? which is right (rework) ??

This is spot on - [reprap.org]

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_______
I await Skynet and my last vision will be of a RepRap self replicating the robots that is destroying the human race.