Post by Deleted on Nov 29, 2008 18:52:27 GMT
I've been out money grubbing for a couple of weeks, but in between hotel rooms the water pump and eccentric strap have appeared. I've never done one before, and whilst the pump body was straightforward, apart from having to screwcut the gland 0.6mm pitch as I didn't have a 9/16" tap and die, the strap caught me out as there was a lot of 'meat' on it which I didn't take account of. This resulted in the two holding bolts being further from the centre than I would have liked. The bolt holes also 'wandered' a little.
Here are some pics for those who may be interested in how it was done. This show is in no way as good as the brilliant Nippon site, but I have to start somewhere! There are a few short cuts here but you should watch your step, especially if you leave packing pieces in the chuck!
After drilling, tapping and machining one end, the pump body is mounted on a threaded stub. There was at least 1/8" to remove, so I used a half centre in the drilled hole to support the end, moved in after every cut, whilst facing the grubby end, just in case the whole job decided to 'flip'. as they do....
The mounting flange is in the way, so I used a little boring bar I picked up from Tracy Tools, and ran the machine backwards. Worked a treat!
Moving on to the strap, it was slit using a 1/32" slitting saw in the Proxxon. This machine is ideal for small delicate jobs like this.
Here is a quick way of centreing the casting in the 4 jaw: no need to make wooden plugs or mark them out. Remove packing before spinning chuck!
Once it was bored and faced it was turned round and the chuck used to press the strap against the packing to ensure parallel running.
Back to the Proxxon to machine the outside diameter. I took off around two mm and decided that was enough! The few marks came out with slight polishing afterwards.
Slotting for the strap connection using a 1/8" carbide slot drill.
Pump body and eccentric waiting to be fitted and measured for the strap. Eight slot Aluminium bronze gland nut.
Steel strap fitted with two 10BA bolts. The cheese head screws will be replaced with bolts just as soon as I find some. I fitted a bronze bush in the strap, just to be sure!
Here are some pics for those who may be interested in how it was done. This show is in no way as good as the brilliant Nippon site, but I have to start somewhere! There are a few short cuts here but you should watch your step, especially if you leave packing pieces in the chuck!
After drilling, tapping and machining one end, the pump body is mounted on a threaded stub. There was at least 1/8" to remove, so I used a half centre in the drilled hole to support the end, moved in after every cut, whilst facing the grubby end, just in case the whole job decided to 'flip'. as they do....
The mounting flange is in the way, so I used a little boring bar I picked up from Tracy Tools, and ran the machine backwards. Worked a treat!
Moving on to the strap, it was slit using a 1/32" slitting saw in the Proxxon. This machine is ideal for small delicate jobs like this.
Here is a quick way of centreing the casting in the 4 jaw: no need to make wooden plugs or mark them out. Remove packing before spinning chuck!
Once it was bored and faced it was turned round and the chuck used to press the strap against the packing to ensure parallel running.
Back to the Proxxon to machine the outside diameter. I took off around two mm and decided that was enough! The few marks came out with slight polishing afterwards.
Slotting for the strap connection using a 1/8" carbide slot drill.
Pump body and eccentric waiting to be fitted and measured for the strap. Eight slot Aluminium bronze gland nut.
Steel strap fitted with two 10BA bolts. The cheese head screws will be replaced with bolts just as soon as I find some. I fitted a bronze bush in the strap, just to be sure!
