Crosman hollow probe build

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   Pete, that was the thinking behind that, in the hope it would help do that and seat the pellet skirt onto the rifling.

Edited by Pauly5 - 12 May 2023 at 4:44pm

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Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 4:42pm
	Pete, that was the thinking behind that, in the hope it would help do that and seat the pellet skirt onto the rifling. Edited by Pauly5 - 12 May 2023 at 4:44pm

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 3:55pm
	Fear not billbob you can always use a drill and a file. You'll have ball if you get one at work,and you got the old fella up the road to give you some seriously good tips and tricks.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 3:37pm
	Hi Paul, I don’t know much about pellets and probes, but would the beveled edge of the probe help in “reshaping” a damaged skirt as it seats it into the barrel? I’ve often wondered if shaping a pellet probe exactly as you have done would be able to gently “re-round” a bent skirt helping it to seal better, be more accurate etc etc…
	Walk quietly, but carry a big stick.

Billbobnz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 14 Jun 2020 Location: Ashburton Status: Offline Posts: 918	Post Options Post Reply Quote Billbobnz Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 2:50pm
	Mate they are making me want to get a lathe..... Hopefully getting one at work soon. So hopefully will finish a few projects around here.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 5:36am
	I found also that when taking close ups up it tends to make every little channel or groove look like a valley. Hence why I was a dubious about if it was just photo or actual finish.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 5:31am
	I drilled it, then followed through with an end mill bit to flatten the bottom of the hole. I will probably try sandpaper on a dowel, but it's the light that makes it look worse than what it is. I don't have any reaming tools.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 5:14am
	That looks good. I prefure a larger bolt handle personally, makes for easier working of bolt when your watching that starling moving around in the tree. Then you only have to take eyes off it to put pellet in. Those little plugs are a good idea to block that screw hole. Are you going to reem/polish the inside of the hollow probe to smooth air flow through it? It may just be the photos make them look worse than they are but it looked pretty rough on the inside.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 4:52am
	I finished drilling and fitting a bolt to the probe last night. The bolt is one I had started ages ago, and is probably too big to most peoples liking, but the good thing is that they are interchangable, so as I develop a good method of making the bolts, I will replace it later. Probe fits and slides well in the breech, but the pellet can catch on that annoying screw hole in the bottom, so I am thinking of turning up small delrin plugs to fit in there, and see if that works. Anyway here's a couple more photos.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 3:32am
	He put a pic of his lathe up on the site here http://www.kiwiairgunners.co.nz/forum_posts.asp?TID=721

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 3:07am
	Yea, it's a small one from the toolshed. Often referred to as a Chinese mini lathe. I've had it a couple of years now and it's addictive learning how to set it up and use it. I'd recommend it if you're looking for another hobby. One thing I have learnt to appreciate is that tolerances are so important, and you can often make an ordinary everyday item better by reducing tolerances.

jwabfrog Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Nov 2021 Location: Thames Status: Offline Posts: 159	Post Options Post Reply Quote jwabfrog Report Post Thanks(0) Quote Reply Posted: 12 May 2023 at 2:36am
	Awesome engineering Pauly, you obviously have a lathe? Jeweller's size or something bigger?

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 11 May 2023 at 12:55pm
	But if it doesn't work you welcome to give us grief for the sujestion

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 11 May 2023 at 12:53pm
	Yep, ok JS and Kruz I agree that would work too. I don't drill the hole in the probe tip, but run a small round file across it. I didn't drill it because the wall is quite thin, and I was concerned if the drill bit snagged it would pull it out of shape and bugger it up. But I could definitely mark it up that way and then form the hole. I'll do it on the next one.

J-S Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 20 Oct 2014 Location: Auckland Status: Offline Posts: 497	Post Options Post Reply Quote J-S Report Post Thanks(0) Quote Reply Posted: 11 May 2023 at 8:07am
	Looks awesome! Could you have done the bolt handle first, close bolt firm in the breech then marked the TP hole for location?
	J S Airguns Air Arms TX200('s) Theoben Sirocco HW77 FWB 300s Webley Patriot One or two others... Current projects: Too many..

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 11 May 2023 at 6:32am
	I haven't tried it on CO2 yet. Kruza, I had made one a while ago, and so I have exact measurements to follow that work for the probe tip, but I have made a hardened centre punch tool for marking the exact position of the bolt hole while the probe is in position. So this definitely works, but haven't compared it with the extended probe, but I feel both benefit over the factory probe by getting the pellet past the transfer port and have less restriction for the air/CO2 to get behind the pellet. I am going to try and make a few while I have my "flow on" if you know what I mean. Billbobnz, I reckon there is an increase, but I often forget to make notes before I start, so don't have the comparison. I have fitted one to my 362, and compared it to a brand new 362 out of the box, and from 8 pumps I am getting 13.8 fpe, and the new std gun got 12.2 fpe with the same pellets.