I am in Sydney (Gosford) and also Brisbane (Gold Coast). One of the RepRap'ers in Brisbane has timing belts. Need to search for you. Also so do www.ausxmod.com.au ??by cluso99 - Australia, Melbourne RUG
I have a design underway using a Parallax Propeller chip (8 core 32bit Risc processor). It is a slow project as I have other things to do besides hobbies :-(by cluso99 - General
I do not have my steppers yet. In Australia we are a bit restricted, as I guess you are.by cluso99 - General
Wrap a piece of paper around the teeth and rub the paper with a pencil which marks the teeth. The open out the paper and measure the distance between say 10 teeth and divide by 10. It should be close enough.by cluso99 - General
Here is a link where I have been building one using some parts from old printers and laser cartridges. Initially I have used timber but didn't drill accurately although most would not matter. I intend to replace with plastic before building anything but I am sure you could do it with timebr if you take your time to be accurate.by cluso99 - General
These look really neat. I will be in the market shortly so I will PM when I am ready.by cluso99 - General
I wish you luck for tonights attempt. Fingers crossedby cluso99 - Reprappers
Here are calculations for working out the "Usable Table Size" (Maximum Parts Size) using my design... X Axis The X axis is governed by the space inside the plastic vertices (i.e. the width between the triangular mounting frame). I have allowed 10mm total for unused space to allow for table overhang and a gap between the plastic. X Usable Width = (Width between plastic - 10mm ) / 2 e.g. for a uby cluso99 - Reprappers
jgilmore: I looked at your suggestion/link. My corner vertices are using the diagonal rods 2 nuts & washers to clamp the horizontal (X) bar. Since I am using 6mm rod, the nuts & washers are cheaper than adding 4mm nuts/washers/bolts as they are required anyway. It is not that I haven't thought about trying to clamp the second rod. re the Z axis: I only use 1 nut/washer at the top and 1 sby cluso99 - Reprappers
Please let me explain a little further. My machine is not functional yet so I will have to pay someone to produce my parts. I do not want to give them part files that will not work because I have not allowed sufficient plastic thickness. As far as the angles and positions of the rods are concerned, I know these are where I want them. So, I know the part will (should) work if there is sufficienby cluso99 - General
Thankyou Bobby cluso99 - Reprappers
TianChang: I have no idea about this. This part is to be used in a micro-mendel version at the vertices. I do not know if any stress analysis has ever been done for the mendel or mini-mendel which could be used for this. My background is in electronics so I would have no idea how to go about calculating this or for that matter how to calculate what the part would provide.by cluso99 - General
Here is my next part. I still need to allow for clearances/tolerances. Two of these are required. The are fastened on the lower front/rear rod and hold the Z axis bearing and a pulley for the X axis belt. I am unsure of the angle the reprap can increase plastic as it rises vertically - can someone please tell me? Also, how do we make a horizontal hole - I have seen a teardrop shape used - how dby cluso99 - Reprappers
Today I purchased another 6mmx1m threaded rod and 20 small washers and 20 nuts. This allowed me to add the extra 2 missing rods. I also purchased 4 x 626-ZRS bearings 6mmIDx19mmODx6mmthick. These are to test using 6mm rod for the Z axis instead of 8mm. I now have enough 6mm rod for this. The 6mm bearings are quite a bit more expensive than the 8mm 608 skate bearings but reduce the number of diffeby cluso99 - Reprappers
mlagana: I want to print it on a reprap. The wood was only for checking the basics and get a feel for the size and some measurements to see exactly how the motors will fit. Now I am embarking on designing the plastics for the actual model. My woodwork is far too sloppy (poor construction) for it to ever really work. Traumflug: Sorry I didn't include measurements here - they are in the heekscad fby cluso99 - General
I have designed a part for my micro-mendel version but I don't know if it has correct thickness, etc. Are there any recommendations for designing parts anywhere? If not, perhaps someone with experience could comment about this part that I designed?by cluso99 - General
It is getting closer but still fighting you all the way. I do hope I can learn from all of your problems and solutions posted here. Thanks.by cluso99 - Reprappers
Congratulations! Getting closer to plastic....by cluso99 - Reprappers
I have noticed on the cheap bubblejet printers they use a white grease. No idea what this is though.by cluso99 - General
I noticed your new wiki entry. I am using bushes harvested from an old set of roller blades and they appear to be good (not motorised yet). However, where can you buy these bushes from? Everywhere I look wants a fortune for these. I have also considered finding PTFE tubing and cutting these into sections.by cluso99 - General
Here is a pic of the bracket that I think may work for all 6 vertices of my micro-mendel. Note the clamp part to hold the round bar. I have included the heekscad file too. I have allowed 5mm of plastic around the bars and rods and the clamp slot is 1.5mm (the thickness is 10mm -1.5mm so 4.75mm per side). The depth is 16mm. I am using 6mm rods and bars. Any comments as to whether this part wouby cluso99 - Reprappers
Here is the frame almost complete. Note it is for a prototype and is not really square due to rough drilling etc. One horizontal threaded rod is missing to hold the extruder. One horizontal rod is missing at the top (a black printer rod has been placed near the final position).by cluso99 - Reprappers
Here is my Z axis parts - currently in wood to determine exact dimensions, etc. The two pieces on the left are for the vertical mount on the Z axis. The larger hole allows the large hex nut to be inserted in the part and fixed from turning. A plastic piece would be extruded to prevent turning but allow the Z carriage to lift if it hit the piece part or table, and hopefully prevent damage to theby cluso99 - Reprappers
Here are two photos of my Y axis and table carriage. Please ignore it not being properly square. The Y bars need to be cut to length. There will be a platform at one end to mount the Y axis NMEA17 motor. When the bars are held correctly aligned the carriage slides quite freely on the nylon bushes. The extra nuts & washers will be used to clamp the X axis belt (in the center of the Y axis) anby cluso99 - Reprappers
Here are my latest thoughts... All motors are below the table. The X & Z motors are in a fixed position. The Y motor is attached to one end of the Y axis and moves along the end of the X axis. The Y bars have another Y rod underneath (not shown) which is used to fasten the X belt to which moves the Y axis. This method, while reducing the usable table width a little, permits the extruder toby cluso99 - Reprappers
I have removed the rubber from the 6mm round bar salvaged from old laser printer cartridges (Xerox Phase 3124). I have 3 @ 275mmx6mm round bars although they have scores making the useful length 230mm plus clamping. While I wait for my 4th cartrige I have a 355mmx6mm round bar from an old Brother DCP-115C bubblejet printer - from the scanner section. The bushes are from a pair of old roller bladby cluso99 - Reprappers
I am thinking about my build. I have seen elsewhere that some RepRaps have used a feeder seperate to the actual extruder connected by an hpfe tube. This would suit my micro-mendel version nicely. I am planning to use the same NMEA17 stepper as the axis. Can anyone verify that this works well? Where can I get some hpfe tubing??? (I am in Australia so shipping costs can be an issue) HPFE PTFE isby cluso99 - Reprappers
Roller Blades Elsewhere I stated I pulled apart two old roller blades that my kids outgrew. They were 10-15 years old. One pair has a nice set of 8 wheels. Each wheel has 2 bearings and two nylon bushes 8mm OD and 6mm ID with a 6mm bolt. These bushes will be great for the carriage bushes for both the X & Y axis (4 required per axis, so I have 2 reprap sets). The Z axis does not require busby cluso99 - Reprappers
Today I extracted the bearing from the skate wheels. Both skates had 2 bearings per wheel. But one set had bearings with a collar while the other were normal. The normal ones, as I said above, have nylon inserts to 6mm bolts and these fit my 6mm rods obtained from the printer I just pulled apart. I also obtained 6mm rods (and others) from a used Xerox Laser cartridge. Unfortunately, the laser carby cluso99 - Reprappers